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Finding the Fourth Proportional to 112.64, 169.64 and 99.26

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Solution

The fourth proportional to 112.64, 169.64 and 99.26 is: 149.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.64 : 169.64 = 99.26 : x
  2. Step 2: Convert to fraction form
    112.64/169.64 = 99.26/x
  3. Step 3: Cross multiply
    112.64x = 169.64 × 99.26
  4. Step 4: Simplify right side
    112.64x = 16,838.47
  5. Step 5: Solve for x
    x = 16,838.47/112.64
  6. Step 6: Final answer
    x = 149.49

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.