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Finding the Fourth Proportional to 129.24, 178.29 and 85.59

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Solution

The fourth proportional to 129.24, 178.29 and 85.59 is: 118.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.24 : 178.29 = 85.59 : x
  2. Step 2: Convert to fraction form
    129.24/178.29 = 85.59/x
  3. Step 3: Cross multiply
    129.24x = 178.29 × 85.59
  4. Step 4: Simplify right side
    129.24x = 15,259.84
  5. Step 5: Solve for x
    x = 15,259.84/129.24
  6. Step 6: Final answer
    x = 118.07

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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.