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Finding the Fourth Proportional to 553.20, 763.68 and 387.52

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Solution

The fourth proportional to 553.20, 763.68 and 387.52 is: 534.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.20 : 763.68 = 387.52 : x
  2. Step 2: Convert to fraction form
    553.20/763.68 = 387.52/x
  3. Step 3: Cross multiply
    553.20x = 763.68 × 387.52
  4. Step 4: Simplify right side
    553.20x = 295,941.27
  5. Step 5: Solve for x
    x = 295,941.27/553.20
  6. Step 6: Final answer
    x = 534.96

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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.