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Finding the Fourth Proportional to 112.51, 168.77 and 66.81

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Solution

The fourth proportional to 112.51, 168.77 and 66.81 is: 100.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.51 : 168.77 = 66.81 : x
  2. Step 2: Convert to fraction form
    112.51/168.77 = 66.81/x
  3. Step 3: Cross multiply
    112.51x = 168.77 × 66.81
  4. Step 4: Simplify right side
    112.51x = 11,275.52
  5. Step 5: Solve for x
    x = 11,275.52/112.51
  6. Step 6: Final answer
    x = 100.22

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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.