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Finding the Fourth Proportional to 48.72, 72.88 and 38.64

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Solution

The fourth proportional to 48.72, 72.88 and 38.64 is: 57.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    48.72 : 72.88 = 38.64 : x
  2. Step 2: Convert to fraction form
    48.72/72.88 = 38.64/x
  3. Step 3: Cross multiply
    48.72x = 72.88 × 38.64
  4. Step 4: Simplify right side
    48.72x = 2,816.08
  5. Step 5: Solve for x
    x = 2,816.08/48.72
  6. Step 6: Final answer
    x = 57.80

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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.