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Finding the Fourth Proportional to 207.16, 285.92 and 129.52

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Solution

The fourth proportional to 207.16, 285.92 and 129.52 is: 178.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    207.16 : 285.92 = 129.52 : x
  2. Step 2: Convert to fraction form
    207.16/285.92 = 129.52/x
  3. Step 3: Cross multiply
    207.16x = 285.92 × 129.52
  4. Step 4: Simplify right side
    207.16x = 37,032.36
  5. Step 5: Solve for x
    x = 37,032.36/207.16
  6. Step 6: Final answer
    x = 178.76

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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.