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Finding the Fourth Proportional to 112.99, 169.49 and 40.86

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Solution

The fourth proportional to 112.99, 169.49 and 40.86 is: 61.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.99 : 169.49 = 40.86 : x
  2. Step 2: Convert to fraction form
    112.99/169.49 = 40.86/x
  3. Step 3: Cross multiply
    112.99x = 169.49 × 40.86
  4. Step 4: Simplify right side
    112.99x = 6,925.36
  5. Step 5: Solve for x
    x = 6,925.36/112.99
  6. Step 6: Final answer
    x = 61.29

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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.