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Finding the Fourth Proportional to 663,120.76, 915,106.78 and 361,314.76

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Solution

The fourth proportional to 663,120.76, 915,106.78 and 361,314.76 is: 498,614.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    663,120.76 : 915,106.78 = 361,314.76 : x
  2. Step 2: Convert to fraction form
    663,120.76/915,106.78 = 361,314.76/x
  3. Step 3: Cross multiply
    663,120.76x = 915,106.78 × 361,314.76
  4. Step 4: Simplify right side
    663,120.76x = 330,641,586,590.07
  5. Step 5: Solve for x
    x = 330,641,586,590.07/663,120.76
  6. Step 6: Final answer
    x = 498,614.44

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.