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Finding the Fourth Proportional to 90.11, 124.88 and 88.49

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Solution

The fourth proportional to 90.11, 124.88 and 88.49 is: 122.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.11 : 124.88 = 88.49 : x
  2. Step 2: Convert to fraction form
    90.11/124.88 = 88.49/x
  3. Step 3: Cross multiply
    90.11x = 124.88 × 88.49
  4. Step 4: Simplify right side
    90.11x = 11,050.63
  5. Step 5: Solve for x
    x = 11,050.63/90.11
  6. Step 6: Final answer
    x = 122.63

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.