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Finding the Fourth Proportional to 48.22, 72.27 and 42.79

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Solution

The fourth proportional to 48.22, 72.27 and 42.79 is: 64.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    48.22 : 72.27 = 42.79 : x
  2. Step 2: Convert to fraction form
    48.22/72.27 = 42.79/x
  3. Step 3: Cross multiply
    48.22x = 72.27 × 42.79
  4. Step 4: Simplify right side
    48.22x = 3,092.43
  5. Step 5: Solve for x
    x = 3,092.43/48.22
  6. Step 6: Final answer
    x = 64.13

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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.