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Finding the Fourth Proportional to 156.72, 216.24 and 91.23

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Solution

The fourth proportional to 156.72, 216.24 and 91.23 is: 125.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.72 : 216.24 = 91.23 : x
  2. Step 2: Convert to fraction form
    156.72/216.24 = 91.23/x
  3. Step 3: Cross multiply
    156.72x = 216.24 × 91.23
  4. Step 4: Simplify right side
    156.72x = 19,727.58
  5. Step 5: Solve for x
    x = 19,727.58/156.72
  6. Step 6: Final answer
    x = 125.88

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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.