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Finding the Fourth Proportional to 90.72, 124.20 and 88.24

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Solution

The fourth proportional to 90.72, 124.20 and 88.24 is: 120.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.72 : 124.20 = 88.24 : x
  2. Step 2: Convert to fraction form
    90.72/124.20 = 88.24/x
  3. Step 3: Cross multiply
    90.72x = 124.20 × 88.24
  4. Step 4: Simplify right side
    90.72x = 10,959.41
  5. Step 5: Solve for x
    x = 10,959.41/90.72
  6. Step 6: Final answer
    x = 120.80

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.