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Finding the Fourth Proportional to 133.52, 200.39 and 72.70

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Solution

The fourth proportional to 133.52, 200.39 and 72.70 is: 109.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    133.52 : 200.39 = 72.70 : x
  2. Step 2: Convert to fraction form
    133.52/200.39 = 72.70/x
  3. Step 3: Cross multiply
    133.52x = 200.39 × 72.70
  4. Step 4: Simplify right side
    133.52x = 14,567.49
  5. Step 5: Solve for x
    x = 14,567.49/133.52
  6. Step 6: Final answer
    x = 109.11

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.