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Finding the Fourth Proportional to 156.31, 234.15 and 112.87

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Solution

The fourth proportional to 156.31, 234.15 and 112.87 is: 169.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.31 : 234.15 = 112.87 : x
  2. Step 2: Convert to fraction form
    156.31/234.15 = 112.87/x
  3. Step 3: Cross multiply
    156.31x = 234.15 × 112.87
  4. Step 4: Simplify right side
    156.31x = 26,428.38
  5. Step 5: Solve for x
    x = 26,428.38/156.31
  6. Step 6: Final answer
    x = 169.08

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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.