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Finding the Fourth Proportional to 984.39, 1,358.48 and 542.31

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Solution

The fourth proportional to 984.39, 1,358.48 and 542.31 is: 748.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    984.39 : 1,358.48 = 542.31 : x
  2. Step 2: Convert to fraction form
    984.39/1,358.48 = 542.31/x
  3. Step 3: Cross multiply
    984.39x = 1,358.48 × 542.31
  4. Step 4: Simplify right side
    984.39x = 736,714.58
  5. Step 5: Solve for x
    x = 736,714.58/984.39
  6. Step 6: Final answer
    x = 748.40

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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.