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Finding the Fourth Proportional to 717.50, 1,070 and 638.84

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Solution

The fourth proportional to 717.50, 1,070 and 638.84 is: 952.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.50 : 1,070 = 638.84 : x
  2. Step 2: Convert to fraction form
    717.50/1,070 = 638.84/x
  3. Step 3: Cross multiply
    717.50x = 1,070 × 638.84
  4. Step 4: Simplify right side
    717.50x = 683,558.80
  5. Step 5: Solve for x
    x = 683,558.80/717.50
  6. Step 6: Final answer
    x = 952.70

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.