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Finding the Fourth Proportional to 615,497.10, 921,145.05 and 515,769.90

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Solution

The fourth proportional to 615,497.10, 921,145.05 and 515,769.90 is: 771,894.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    615,497.10 : 921,145.05 = 515,769.90 : x
  2. Step 2: Convert to fraction form
    615,497.10/921,145.05 = 515,769.90/x
  3. Step 3: Cross multiply
    615,497.10x = 921,145.05 × 515,769.90
  4. Step 4: Simplify right side
    615,497.10x = 475,098,890,324.00
  5. Step 5: Solve for x
    x = 475,098,890,324.00/615,497.10
  6. Step 6: Final answer
    x = 771,894.60

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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.