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Finding the Fourth Proportional to 112.71, 155.53 and 79.91

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Solution

The fourth proportional to 112.71, 155.53 and 79.91 is: 110.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.71 : 155.53 = 79.91 : x
  2. Step 2: Convert to fraction form
    112.71/155.53 = 79.91/x
  3. Step 3: Cross multiply
    112.71x = 155.53 × 79.91
  4. Step 4: Simplify right side
    112.71x = 12,428.40
  5. Step 5: Solve for x
    x = 12,428.40/112.71
  6. Step 6: Final answer
    x = 110.27

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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.