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Finding the Fourth Proportional to 663,120.75, 915,106.77 and 361,314.75

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Solution

The fourth proportional to 663,120.75, 915,106.77 and 361,314.75 is: 498,614.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    663,120.75 : 915,106.77 = 361,314.75 : x
  2. Step 2: Convert to fraction form
    663,120.75/915,106.77 = 361,314.75/x
  3. Step 3: Cross multiply
    663,120.75x = 915,106.77 × 361,314.75
  4. Step 4: Simplify right side
    663,120.75x = 330,641,573,825.86
  5. Step 5: Solve for x
    x = 330,641,573,825.86/663,120.75
  6. Step 6: Final answer
    x = 498,614.43

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Double scale
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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.