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Finding the Fourth Proportional to 615,543.10, 921,214.05 and 515,815.90

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Solution

The fourth proportional to 615,543.10, 921,214.05 and 515,815.90 is: 771,963.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    615,543.10 : 921,214.05 = 515,815.90 : x
  2. Step 2: Convert to fraction form
    615,543.10/921,214.05 = 515,815.90/x
  3. Step 3: Cross multiply
    615,543.10x = 921,214.05 × 515,815.90
  4. Step 4: Simplify right side
    615,543.10x = 475,176,854,293.40
  5. Step 5: Solve for x
    x = 475,176,854,293.40/615,543.10
  6. Step 6: Final answer
    x = 771,963.58

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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.