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Finding the Fourth Proportional to 129.08, 177.61 and 111.54

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Solution

The fourth proportional to 129.08, 177.61 and 111.54 is: 153.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.08 : 177.61 = 111.54 : x
  2. Step 2: Convert to fraction form
    129.08/177.61 = 111.54/x
  3. Step 3: Cross multiply
    129.08x = 177.61 × 111.54
  4. Step 4: Simplify right side
    129.08x = 19,810.91
  5. Step 5: Solve for x
    x = 19,810.91/129.08
  6. Step 6: Final answer
    x = 153.47

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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.