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Finding the Fourth Proportional to 156.95, 216.17 and 125.78

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Solution

The fourth proportional to 156.95, 216.17 and 125.78 is: 173.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.95 : 216.17 = 125.78 : x
  2. Step 2: Convert to fraction form
    156.95/216.17 = 125.78/x
  3. Step 3: Cross multiply
    156.95x = 216.17 × 125.78
  4. Step 4: Simplify right side
    156.95x = 27,188.15
  5. Step 5: Solve for x
    x = 27,188.15/156.95
  6. Step 6: Final answer
    x = 173.23

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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.