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Finding the Fourth Proportional to 681.42, 939.28 and 624.92

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Solution

The fourth proportional to 681.42, 939.28 and 624.92 is: 861.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.42 : 939.28 = 624.92 : x
  2. Step 2: Convert to fraction form
    681.42/939.28 = 624.92/x
  3. Step 3: Cross multiply
    681.42x = 939.28 × 624.92
  4. Step 4: Simplify right side
    681.42x = 586,974.86
  5. Step 5: Solve for x
    x = 586,974.86/681.42
  6. Step 6: Final answer
    x = 861.40

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.