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Finding the Fourth Proportional to 663,321, 915,407.70 and 376,889.60

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Solution

The fourth proportional to 663,321, 915,407.70 and 376,889.60 is: 520,121.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    663,321 : 915,407.70 = 376,889.60 : x
  2. Step 2: Convert to fraction form
    663,321/915,407.70 = 376,889.60/x
  3. Step 3: Cross multiply
    663,321x = 915,407.70 × 376,889.60
  4. Step 4: Simplify right side
    663,321x = 345,007,641,889.92
  5. Step 5: Solve for x
    x = 345,007,641,889.92/663,321
  6. Step 6: Final answer
    x = 520,121.69

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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.