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Finding the Fourth Proportional to 129.88, 178.82 and 111.16

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Solution

The fourth proportional to 129.88, 178.82 and 111.16 is: 153.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.88 : 178.82 = 111.16 : x
  2. Step 2: Convert to fraction form
    129.88/178.82 = 111.16/x
  3. Step 3: Cross multiply
    129.88x = 178.82 × 111.16
  4. Step 4: Simplify right side
    129.88x = 19,877.63
  5. Step 5: Solve for x
    x = 19,877.63/129.88
  6. Step 6: Final answer
    x = 153.05

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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.