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Finding the Fourth Proportional to 553.12, 763.20 and 387.28

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Solution

The fourth proportional to 553.12, 763.20 and 387.28 is: 534.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.12 : 763.20 = 387.28 : x
  2. Step 2: Convert to fraction form
    553.12/763.20 = 387.28/x
  3. Step 3: Cross multiply
    553.12x = 763.20 × 387.28
  4. Step 4: Simplify right side
    553.12x = 295,572.10
  5. Step 5: Solve for x
    x = 295,572.10/553.12
  6. Step 6: Final answer
    x = 534.37

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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.