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Finding the Fourth Proportional to 717.24, 1,073.68 and 648.78

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Solution

The fourth proportional to 717.24, 1,073.68 and 648.78 is: 971.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.24 : 1,073.68 = 648.78 : x
  2. Step 2: Convert to fraction form
    717.24/1,073.68 = 648.78/x
  3. Step 3: Cross multiply
    717.24x = 1,073.68 × 648.78
  4. Step 4: Simplify right side
    717.24x = 696,582.11
  5. Step 5: Solve for x
    x = 696,582.11/717.24
  6. Step 6: Final answer
    x = 971.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.