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Finding the Fourth Proportional to 84.48, 126 and 83.28

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Solution

The fourth proportional to 84.48, 126 and 83.28 is: 124.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.48 : 126 = 83.28 : x
  2. Step 2: Convert to fraction form
    84.48/126 = 83.28/x
  3. Step 3: Cross multiply
    84.48x = 126 × 83.28
  4. Step 4: Simplify right side
    84.48x = 10,493.28
  5. Step 5: Solve for x
    x = 10,493.28/84.48
  6. Step 6: Final answer
    x = 124.21

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1.5x scale

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.