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Finding the Fourth Proportional to 984.38, 1,358.50 and 542.28

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Solution

The fourth proportional to 984.38, 1,358.50 and 542.28 is: 748.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    984.38 : 1,358.50 = 542.28 : x
  2. Step 2: Convert to fraction form
    984.38/1,358.50 = 542.28/x
  3. Step 3: Cross multiply
    984.38x = 1,358.50 × 542.28
  4. Step 4: Simplify right side
    984.38x = 736,687.83
  5. Step 5: Solve for x
    x = 736,687.83/984.38
  6. Step 6: Final answer
    x = 748.38

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Double scale
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1.5x scale

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.