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Finding the Fourth Proportional to 763.72, 1,053.60 and 542.80

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Solution

The fourth proportional to 763.72, 1,053.60 and 542.80 is: 748.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.72 : 1,053.60 = 542.80 : x
  2. Step 2: Convert to fraction form
    763.72/1,053.60 = 542.80/x
  3. Step 3: Cross multiply
    763.72x = 1,053.60 × 542.80
  4. Step 4: Simplify right side
    763.72x = 571,894.08
  5. Step 5: Solve for x
    x = 571,894.08/763.72
  6. Step 6: Final answer
    x = 748.83

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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.