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Finding the Fourth Proportional to 112.80, 169.16 and 40.64

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Solution

The fourth proportional to 112.80, 169.16 and 40.64 is: 60.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.80 : 169.16 = 40.64 : x
  2. Step 2: Convert to fraction form
    112.80/169.16 = 40.64/x
  3. Step 3: Cross multiply
    112.80x = 169.16 × 40.64
  4. Step 4: Simplify right side
    112.80x = 6,875.19
  5. Step 5: Solve for x
    x = 6,875.19/112.80
  6. Step 6: Final answer
    x = 60.95

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.