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Finding the Fourth Proportional to 48.63, 72.89 and 18.21

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Solution

The fourth proportional to 48.63, 72.89 and 18.21 is: 27.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    48.63 : 72.89 = 18.21 : x
  2. Step 2: Convert to fraction form
    48.63/72.89 = 18.21/x
  3. Step 3: Cross multiply
    48.63x = 72.89 × 18.21
  4. Step 4: Simplify right side
    48.63x = 1,327.54
  5. Step 5: Solve for x
    x = 1,327.54/48.63
  6. Step 6: Final answer
    x = 27.30

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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.