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Finding the Fourth Proportional to 82.80, 124.04 and 55.70

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Solution

The fourth proportional to 82.80, 124.04 and 55.70 is: 83.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.80 : 124.04 = 55.70 : x
  2. Step 2: Convert to fraction form
    82.80/124.04 = 55.70/x
  3. Step 3: Cross multiply
    82.80x = 124.04 × 55.70
  4. Step 4: Simplify right side
    82.80x = 6,909.01
  5. Step 5: Solve for x
    x = 6,909.01/82.80
  6. Step 6: Final answer
    x = 83.44

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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.