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Finding the Fourth Proportional to 111.68, 166.76 and 90.08

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Solution

The fourth proportional to 111.68, 166.76 and 90.08 is: 134.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.68 : 166.76 = 90.08 : x
  2. Step 2: Convert to fraction form
    111.68/166.76 = 90.08/x
  3. Step 3: Cross multiply
    111.68x = 166.76 × 90.08
  4. Step 4: Simplify right side
    111.68x = 15,021.74
  5. Step 5: Solve for x
    x = 15,021.74/111.68
  6. Step 6: Final answer
    x = 134.51

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.