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Finding the Fourth Proportional to 144.72, 216.76 and 129.36

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Solution

The fourth proportional to 144.72, 216.76 and 129.36 is: 193.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.72 : 216.76 = 129.36 : x
  2. Step 2: Convert to fraction form
    144.72/216.76 = 129.36/x
  3. Step 3: Cross multiply
    144.72x = 216.76 × 129.36
  4. Step 4: Simplify right side
    144.72x = 28,040.07
  5. Step 5: Solve for x
    x = 28,040.07/144.72
  6. Step 6: Final answer
    x = 193.75

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.