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Finding the Fourth Proportional to 458.60, 687.82 and 129.51

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Solution

The fourth proportional to 458.60, 687.82 and 129.51 is: 194.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    458.60 : 687.82 = 129.51 : x
  2. Step 2: Convert to fraction form
    458.60/687.82 = 129.51/x
  3. Step 3: Cross multiply
    458.60x = 687.82 × 129.51
  4. Step 4: Simplify right side
    458.60x = 89,079.24
  5. Step 5: Solve for x
    x = 89,079.24/458.60
  6. Step 6: Final answer
    x = 194.24

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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.