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Finding the Fourth Proportional to 615,540.10, 921,209.55 and 515,812.90

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Solution

The fourth proportional to 615,540.10, 921,209.55 and 515,812.90 is: 771,959.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    615,540.10 : 921,209.55 = 515,812.90 : x
  2. Step 2: Convert to fraction form
    615,540.10/921,209.55 = 515,812.90/x
  3. Step 3: Cross multiply
    615,540.10x = 921,209.55 × 515,812.90
  4. Step 4: Simplify right side
    615,540.10x = 475,171,769,493.20
  5. Step 5: Solve for x
    x = 475,171,769,493.20/615,540.10
  6. Step 6: Final answer
    x = 771,959.08

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.