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Finding the Fourth Proportional to 681.41, 939.28 and 624.91

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Solution

The fourth proportional to 681.41, 939.28 and 624.91 is: 861.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.41 : 939.28 = 624.91 : x
  2. Step 2: Convert to fraction form
    681.41/939.28 = 624.91/x
  3. Step 3: Cross multiply
    681.41x = 939.28 × 624.91
  4. Step 4: Simplify right side
    681.41x = 586,965.46
  5. Step 5: Solve for x
    x = 586,965.46/681.41
  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.