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Finding the Fourth Proportional to 112.90, 155.79 and 66.29

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Solution

The fourth proportional to 112.90, 155.79 and 66.29 is: 91.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.90 : 155.79 = 66.29 : x
  2. Step 2: Convert to fraction form
    112.90/155.79 = 66.29/x
  3. Step 3: Cross multiply
    112.90x = 155.79 × 66.29
  4. Step 4: Simplify right side
    112.90x = 10,327.32
  5. Step 5: Solve for x
    x = 10,327.32/112.90
  6. Step 6: Final answer
    x = 91.47

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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.