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Finding the Fourth Proportional to 156.31, 215.66 and 97.27

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Solution

The fourth proportional to 156.31, 215.66 and 97.27 is: 134.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.31 : 215.66 = 97.27 : x
  2. Step 2: Convert to fraction form
    156.31/215.66 = 97.27/x
  3. Step 3: Cross multiply
    156.31x = 215.66 × 97.27
  4. Step 4: Simplify right side
    156.31x = 20,976.17
  5. Step 5: Solve for x
    x = 20,976.17/156.31
  6. Step 6: Final answer
    x = 134.20

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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.