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Finding the Fourth Proportional to 624.68, 865.70 and 615.87

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Solution

The fourth proportional to 624.68, 865.70 and 615.87 is: 853.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    624.68 : 865.70 = 615.87 : x
  2. Step 2: Convert to fraction form
    624.68/865.70 = 615.87/x
  3. Step 3: Cross multiply
    624.68x = 865.70 × 615.87
  4. Step 4: Simplify right side
    624.68x = 533,160.20
  5. Step 5: Solve for x
    x = 533,160.20/624.68
  6. Step 6: Final answer
    x = 853.49

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.