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Finding the Fourth Proportional to 747.71, 1,121.76 and 285.47

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Solution

The fourth proportional to 747.71, 1,121.76 and 285.47 is: 428.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.71 : 1,121.76 = 285.47 : x
  2. Step 2: Convert to fraction form
    747.71/1,121.76 = 285.47/x
  3. Step 3: Cross multiply
    747.71x = 1,121.76 × 285.47
  4. Step 4: Simplify right side
    747.71x = 320,228.83
  5. Step 5: Solve for x
    x = 320,228.83/747.71
  6. Step 6: Final answer
    x = 428.28

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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.