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Finding the Fourth Proportional to 112.71, 155.50 and 66.07

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Solution

The fourth proportional to 112.71, 155.50 and 66.07 is: 91.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.71 : 155.50 = 66.07 : x
  2. Step 2: Convert to fraction form
    112.71/155.50 = 66.07/x
  3. Step 3: Cross multiply
    112.71x = 155.50 × 66.07
  4. Step 4: Simplify right side
    112.71x = 10,273.89
  5. Step 5: Solve for x
    x = 10,273.89/112.71
  6. Step 6: Final answer
    x = 91.15

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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.