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Finding the Fourth Proportional to 112.80, 155.68 and 66.16

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Solution

The fourth proportional to 112.80, 155.68 and 66.16 is: 91.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.80 : 155.68 = 66.16 : x
  2. Step 2: Convert to fraction form
    112.80/155.68 = 66.16/x
  3. Step 3: Cross multiply
    112.80x = 155.68 × 66.16
  4. Step 4: Simplify right side
    112.80x = 10,299.79
  5. Step 5: Solve for x
    x = 10,299.79/112.80
  6. Step 6: Final answer
    x = 91.31

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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.