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Finding the Fourth Proportional to 681.35, 938.39 and 679.32

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Solution

The fourth proportional to 681.35, 938.39 and 679.32 is: 935.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.35 : 938.39 = 679.32 : x
  2. Step 2: Convert to fraction form
    681.35/938.39 = 679.32/x
  3. Step 3: Cross multiply
    681.35x = 938.39 × 679.32
  4. Step 4: Simplify right side
    681.35x = 637,463.70
  5. Step 5: Solve for x
    x = 637,463.70/681.35
  6. Step 6: Final answer
    x = 935.60

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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.