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Finding the Fourth Proportional to 48.13, 72.22 and 21.07

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Solution

The fourth proportional to 48.13, 72.22 and 21.07 is: 31.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    48.13 : 72.22 = 21.07 : x
  2. Step 2: Convert to fraction form
    48.13/72.22 = 21.07/x
  3. Step 3: Cross multiply
    48.13x = 72.22 × 21.07
  4. Step 4: Simplify right side
    48.13x = 1,521.44
  5. Step 5: Solve for x
    x = 1,521.44/48.13
  6. Step 6: Final answer
    x = 31.61

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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.