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Finding the Fourth Proportional to 615,539.10, 921,208.05 and 515,811.90

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Solution

The fourth proportional to 615,539.10, 921,208.05 and 515,811.90 is: 771,957.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    615,539.10 : 921,208.05 = 515,811.90 : x
  2. Step 2: Convert to fraction form
    615,539.10/921,208.05 = 515,811.90/x
  3. Step 3: Cross multiply
    615,539.10x = 921,208.05 × 515,811.90
  4. Step 4: Simplify right side
    615,539.10x = 475,170,074,565.80
  5. Step 5: Solve for x
    x = 475,170,074,565.80/615,539.10
  6. Step 6: Final answer
    x = 771,957.58

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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.