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Finding the Fourth Proportional to 49.20, 67.72 and 43.08

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Solution

The fourth proportional to 49.20, 67.72 and 43.08 is: 59.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    49.20 : 67.72 = 43.08 : x
  2. Step 2: Convert to fraction form
    49.20/67.72 = 43.08/x
  3. Step 3: Cross multiply
    49.20x = 67.72 × 43.08
  4. Step 4: Simplify right side
    49.20x = 2,917.38
  5. Step 5: Solve for x
    x = 2,917.38/49.20
  6. Step 6: Final answer
    x = 59.30

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.