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Finding the Fourth Proportional to 129.18, 177.75 and 113.69

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Solution

The fourth proportional to 129.18, 177.75 and 113.69 is: 156.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.18 : 177.75 = 113.69 : x
  2. Step 2: Convert to fraction form
    129.18/177.75 = 113.69/x
  3. Step 3: Cross multiply
    129.18x = 177.75 × 113.69
  4. Step 4: Simplify right side
    129.18x = 20,208.40
  5. Step 5: Solve for x
    x = 20,208.40/129.18
  6. Step 6: Final answer
    x = 156.44

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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.