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Finding the Fourth Proportional to 984.64, 1,358.79 and 542.54

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Solution

The fourth proportional to 984.64, 1,358.79 and 542.54 is: 748.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    984.64 : 1,358.79 = 542.54 : x
  2. Step 2: Convert to fraction form
    984.64/1,358.79 = 542.54/x
  3. Step 3: Cross multiply
    984.64x = 1,358.79 × 542.54
  4. Step 4: Simplify right side
    984.64x = 737,191.13
  5. Step 5: Solve for x
    x = 737,191.13/984.64
  6. Step 6: Final answer
    x = 748.69

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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.