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Finding the Fourth Proportional to 82.78, 124.07 and 53.91

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Solution

The fourth proportional to 82.78, 124.07 and 53.91 is: 80.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.78 : 124.07 = 53.91 : x
  2. Step 2: Convert to fraction form
    82.78/124.07 = 53.91/x
  3. Step 3: Cross multiply
    82.78x = 124.07 × 53.91
  4. Step 4: Simplify right side
    82.78x = 6,688.45
  5. Step 5: Solve for x
    x = 6,688.45/82.78
  6. Step 6: Final answer
    x = 80.80

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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.