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Finding the Fourth Proportional to 48.72, 73.52 and 47.20

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Solution

The fourth proportional to 48.72, 73.52 and 47.20 is: 71.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    48.72 : 73.52 = 47.20 : x
  2. Step 2: Convert to fraction form
    48.72/73.52 = 47.20/x
  3. Step 3: Cross multiply
    48.72x = 73.52 × 47.20
  4. Step 4: Simplify right side
    48.72x = 3,470.14
  5. Step 5: Solve for x
    x = 3,470.14/48.72
  6. Step 6: Final answer
    x = 71.23

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.