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Finding the Fourth Proportional to 82.88, 124 and 57.28

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Solution

The fourth proportional to 82.88, 124 and 57.28 is: 85.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.88 : 124 = 57.28 : x
  2. Step 2: Convert to fraction form
    82.88/124 = 57.28/x
  3. Step 3: Cross multiply
    82.88x = 124 × 57.28
  4. Step 4: Simplify right side
    82.88x = 7,102.72
  5. Step 5: Solve for x
    x = 7,102.72/82.88
  6. Step 6: Final answer
    x = 85.70

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.