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Finding the Fourth Proportional to 984.55, 1,358.70 and 542.45

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Solution

The fourth proportional to 984.55, 1,358.70 and 542.45 is: 748.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    984.55 : 1,358.70 = 542.45 : x
  2. Step 2: Convert to fraction form
    984.55/1,358.70 = 542.45/x
  3. Step 3: Cross multiply
    984.55x = 1,358.70 × 542.45
  4. Step 4: Simplify right side
    984.55x = 737,017.31
  5. Step 5: Solve for x
    x = 737,017.31/984.55
  6. Step 6: Final answer
    x = 748.58

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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.