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Finding the Fourth Proportional to 747.28, 1,121.29 and 285.35

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Solution

The fourth proportional to 747.28, 1,121.29 and 285.35 is: 428.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.28 : 1,121.29 = 285.35 : x
  2. Step 2: Convert to fraction form
    747.28/1,121.29 = 285.35/x
  3. Step 3: Cross multiply
    747.28x = 1,121.29 × 285.35
  4. Step 4: Simplify right side
    747.28x = 319,958.54
  5. Step 5: Solve for x
    x = 319,958.54/747.28
  6. Step 6: Final answer
    x = 428.17

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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.