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Finding the Fourth Proportional to 717.92, 988.44 and 715.76

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Solution

The fourth proportional to 717.92, 988.44 and 715.76 is: 985.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.92 : 988.44 = 715.76 : x
  2. Step 2: Convert to fraction form
    717.92/988.44 = 715.76/x
  3. Step 3: Cross multiply
    717.92x = 988.44 × 715.76
  4. Step 4: Simplify right side
    717.92x = 707,485.81
  5. Step 5: Solve for x
    x = 707,485.81/717.92
  6. Step 6: Final answer
    x = 985.47

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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.