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Finding the Fourth Proportional to 48.65, 67.12 and 28.96

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Solution

The fourth proportional to 48.65, 67.12 and 28.96 is: 39.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    48.65 : 67.12 = 28.96 : x
  2. Step 2: Convert to fraction form
    48.65/67.12 = 28.96/x
  3. Step 3: Cross multiply
    48.65x = 67.12 × 28.96
  4. Step 4: Simplify right side
    48.65x = 1,943.56
  5. Step 5: Solve for x
    x = 1,943.56/48.65
  6. Step 6: Final answer
    x = 39.95

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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.