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Finding the Fourth Proportional to 90.37, 124.77 and 80.65

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Solution

The fourth proportional to 90.37, 124.77 and 80.65 is: 111.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.37 : 124.77 = 80.65 : x
  2. Step 2: Convert to fraction form
    90.37/124.77 = 80.65/x
  3. Step 3: Cross multiply
    90.37x = 124.77 × 80.65
  4. Step 4: Simplify right side
    90.37x = 10,062.70
  5. Step 5: Solve for x
    x = 10,062.70/90.37
  6. Step 6: Final answer
    x = 111.35

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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.