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Finding the Fourth Proportional to 124.12, 186 and 72.80

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Solution

The fourth proportional to 124.12, 186 and 72.80 is: 109.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.12 : 186 = 72.80 : x
  2. Step 2: Convert to fraction form
    124.12/186 = 72.80/x
  3. Step 3: Cross multiply
    124.12x = 186 × 72.80
  4. Step 4: Simplify right side
    124.12x = 13,540.80
  5. Step 5: Solve for x
    x = 13,540.80/124.12
  6. Step 6: Final answer
    x = 109.09

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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.