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Finding the Fourth Proportional to 854.89, 1,281.15 and 624.31

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Solution

The fourth proportional to 854.89, 1,281.15 and 624.31 is: 935.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    854.89 : 1,281.15 = 624.31 : x
  2. Step 2: Convert to fraction form
    854.89/1,281.15 = 624.31/x
  3. Step 3: Cross multiply
    854.89x = 1,281.15 × 624.31
  4. Step 4: Simplify right side
    854.89x = 799,831.55
  5. Step 5: Solve for x
    x = 799,831.55/854.89
  6. Step 6: Final answer
    x = 935.60

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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.