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Finding the Fourth Proportional to 34.79, 48.02 and 21.86

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Solution

The fourth proportional to 34.79, 48.02 and 21.86 is: 30.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    34.79 : 48.02 = 21.86 : x
  2. Step 2: Convert to fraction form
    34.79/48.02 = 21.86/x
  3. Step 3: Cross multiply
    34.79x = 48.02 × 21.86
  4. Step 4: Simplify right side
    34.79x = 1,049.37
  5. Step 5: Solve for x
    x = 1,049.37/34.79
  6. Step 6: Final answer
    x = 30.17

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.