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Finding the Fourth Proportional to 143.88, 216.84 and 129.46

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Solution

The fourth proportional to 143.88, 216.84 and 129.46 is: 195.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.88 : 216.84 = 129.46 : x
  2. Step 2: Convert to fraction form
    143.88/216.84 = 129.46/x
  3. Step 3: Cross multiply
    143.88x = 216.84 × 129.46
  4. Step 4: Simplify right side
    143.88x = 28,070.75
  5. Step 5: Solve for x
    x = 28,070.75/143.88
  6. Step 6: Final answer
    x = 195.09

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.