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Finding the Fourth Proportional to 458.40, 687.40 and 133.70

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Solution

The fourth proportional to 458.40, 687.40 and 133.70 is: 200.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    458.40 : 687.40 = 133.70 : x
  2. Step 2: Convert to fraction form
    458.40/687.40 = 133.70/x
  3. Step 3: Cross multiply
    458.40x = 687.40 × 133.70
  4. Step 4: Simplify right side
    458.40x = 91,901.61
  5. Step 5: Solve for x
    x = 91,901.61/458.40
  6. Step 6: Final answer
    x = 200.48

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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.