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Finding the Fourth Proportional to 48.79, 73.16 and 21.71

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Solution

The fourth proportional to 48.79, 73.16 and 21.71 is: 32.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    48.79 : 73.16 = 21.71 : x
  2. Step 2: Convert to fraction form
    48.79/73.16 = 21.71/x
  3. Step 3: Cross multiply
    48.79x = 73.16 × 21.71
  4. Step 4: Simplify right side
    48.79x = 1,588.30
  5. Step 5: Solve for x
    x = 1,588.30/48.79
  6. Step 6: Final answer
    x = 32.55

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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.