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Finding the Fourth Proportional to 938.71, 1,293.12 and 717.58

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Solution

The fourth proportional to 938.71, 1,293.12 and 717.58 is: 988.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.71 : 1,293.12 = 717.58 : x
  2. Step 2: Convert to fraction form
    938.71/1,293.12 = 717.58/x
  3. Step 3: Cross multiply
    938.71x = 1,293.12 × 717.58
  4. Step 4: Simplify right side
    938.71x = 927,913.82
  5. Step 5: Solve for x
    x = 927,913.82/938.71
  6. Step 6: Final answer
    x = 988.50

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Half scale
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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.