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Finding the Fourth Proportional to 891.75, 1,230.75 and 542.64

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Solution

The fourth proportional to 891.75, 1,230.75 and 542.64 is: 748.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.75 : 1,230.75 = 542.64 : x
  2. Step 2: Convert to fraction form
    891.75/1,230.75 = 542.64/x
  3. Step 3: Cross multiply
    891.75x = 1,230.75 × 542.64
  4. Step 4: Simplify right side
    891.75x = 667,854.18
  5. Step 5: Solve for x
    x = 667,854.18/891.75
  6. Step 6: Final answer
    x = 748.93

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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.