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Finding the Fourth Proportional to 113.71, 156.91 and 61.96

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Solution

The fourth proportional to 113.71, 156.91 and 61.96 is: 85.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.71 : 156.91 = 61.96 : x
  2. Step 2: Convert to fraction form
    113.71/156.91 = 61.96/x
  3. Step 3: Cross multiply
    113.71x = 156.91 × 61.96
  4. Step 4: Simplify right side
    113.71x = 9,722.14
  5. Step 5: Solve for x
    x = 9,722.14/113.71
  6. Step 6: Final answer
    x = 85.50

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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.