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Finding the Fourth Proportional to 458.49, 687.66 and 133.89

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Solution

The fourth proportional to 458.49, 687.66 and 133.89 is: 200.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    458.49 : 687.66 = 133.89 : x
  2. Step 2: Convert to fraction form
    458.49/687.66 = 133.89/x
  3. Step 3: Cross multiply
    458.49x = 687.66 × 133.89
  4. Step 4: Simplify right side
    458.49x = 92,070.80
  5. Step 5: Solve for x
    x = 92,070.80/458.49
  6. Step 6: Final answer
    x = 200.81

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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.