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Finding the Fourth Proportional to 747.32, 1,121.30 and 285.23

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Solution

The fourth proportional to 747.32, 1,121.30 and 285.23 is: 427.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.32 : 1,121.30 = 285.23 : x
  2. Step 2: Convert to fraction form
    747.32/1,121.30 = 285.23/x
  3. Step 3: Cross multiply
    747.32x = 1,121.30 × 285.23
  4. Step 4: Simplify right side
    747.32x = 319,829.78
  5. Step 5: Solve for x
    x = 319,829.78/747.32
  6. Step 6: Final answer
    x = 427.97

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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.