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Finding the Fourth Proportional to 48.72, 67.20 and 29.28

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Solution

The fourth proportional to 48.72, 67.20 and 29.28 is: 40.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    48.72 : 67.20 = 29.28 : x
  2. Step 2: Convert to fraction form
    48.72/67.20 = 29.28/x
  3. Step 3: Cross multiply
    48.72x = 67.20 × 29.28
  4. Step 4: Simplify right side
    48.72x = 1,967.62
  5. Step 5: Solve for x
    x = 1,967.62/48.72
  6. Step 6: Final answer
    x = 40.39

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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.