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Finding the Fourth Proportional to 48.18, 71.79 and 47.72

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Solution

The fourth proportional to 48.18, 71.79 and 47.72 is: 71.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    48.18 : 71.79 = 47.72 : x
  2. Step 2: Convert to fraction form
    48.18/71.79 = 47.72/x
  3. Step 3: Cross multiply
    48.18x = 71.79 × 47.72
  4. Step 4: Simplify right side
    48.18x = 3,425.46
  5. Step 5: Solve for x
    x = 3,425.46/48.18
  6. Step 6: Final answer
    x = 71.10

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.