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Finding the Fourth Proportional to 90.11, 124.43 and 71.82

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Solution

The fourth proportional to 90.11, 124.43 and 71.82 is: 99.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.11 : 124.43 = 71.82 : x
  2. Step 2: Convert to fraction form
    90.11/124.43 = 71.82/x
  3. Step 3: Cross multiply
    90.11x = 124.43 × 71.82
  4. Step 4: Simplify right side
    90.11x = 8,936.56
  5. Step 5: Solve for x
    x = 8,936.56/90.11
  6. Step 6: Final answer
    x = 99.18

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.