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Finding the Fourth Proportional to 717.75, 988.95 and 496.31

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Solution

The fourth proportional to 717.75, 988.95 and 496.31 is: 683.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.75 : 988.95 = 496.31 : x
  2. Step 2: Convert to fraction form
    717.75/988.95 = 496.31/x
  3. Step 3: Cross multiply
    717.75x = 988.95 × 496.31
  4. Step 4: Simplify right side
    717.75x = 490,820.83
  5. Step 5: Solve for x
    x = 490,820.83/717.75
  6. Step 6: Final answer
    x = 683.83

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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.