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Finding the Fourth Proportional to 129.06, 177.99 and 112.50

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Solution

The fourth proportional to 129.06, 177.99 and 112.50 is: 155.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.06 : 177.99 = 112.50 : x
  2. Step 2: Convert to fraction form
    129.06/177.99 = 112.50/x
  3. Step 3: Cross multiply
    129.06x = 177.99 × 112.50
  4. Step 4: Simplify right side
    129.06x = 20,023.88
  5. Step 5: Solve for x
    x = 20,023.88/129.06
  6. Step 6: Final answer
    x = 155.15

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.