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Finding the Fourth Proportional to 458.42, 687.76 and 133.80

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Solution

The fourth proportional to 458.42, 687.76 and 133.80 is: 200.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    458.42 : 687.76 = 133.80 : x
  2. Step 2: Convert to fraction form
    458.42/687.76 = 133.80/x
  3. Step 3: Cross multiply
    458.42x = 687.76 × 133.80
  4. Step 4: Simplify right side
    458.42x = 92,022.29
  5. Step 5: Solve for x
    x = 92,022.29/458.42
  6. Step 6: Final answer
    x = 200.74

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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.