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Finding the Fourth Proportional to 129.49, 178.50 and 111.93

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Solution

The fourth proportional to 129.49, 178.50 and 111.93 is: 154.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.49 : 178.50 = 111.93 : x
  2. Step 2: Convert to fraction form
    129.49/178.50 = 111.93/x
  3. Step 3: Cross multiply
    129.49x = 178.50 × 111.93
  4. Step 4: Simplify right side
    129.49x = 19,979.51
  5. Step 5: Solve for x
    x = 19,979.51/129.49
  6. Step 6: Final answer
    x = 154.29

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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.