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Finding the Fourth Proportional to 113.67, 156.74 and 76.92

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Solution

The fourth proportional to 113.67, 156.74 and 76.92 is: 106.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.67 : 156.74 = 76.92 : x
  2. Step 2: Convert to fraction form
    113.67/156.74 = 76.92/x
  3. Step 3: Cross multiply
    113.67x = 156.74 × 76.92
  4. Step 4: Simplify right side
    113.67x = 12,055.47
  5. Step 5: Solve for x
    x = 12,055.47/113.67
  6. Step 6: Final answer
    x = 106.06

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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.