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Finding the Fourth Proportional to 48.76, 67.39 and 40.55

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Solution

The fourth proportional to 48.76, 67.39 and 40.55 is: 56.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    48.76 : 67.39 = 40.55 : x
  2. Step 2: Convert to fraction form
    48.76/67.39 = 40.55/x
  3. Step 3: Cross multiply
    48.76x = 67.39 × 40.55
  4. Step 4: Simplify right side
    48.76x = 2,732.73
  5. Step 5: Solve for x
    x = 2,732.73/48.76
  6. Step 6: Final answer
    x = 56.05

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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.