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Finding the Fourth Proportional to 34.48, 47.68 and 31.76

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Solution

The fourth proportional to 34.48, 47.68 and 31.76 is: 43.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    34.48 : 47.68 = 31.76 : x
  2. Step 2: Convert to fraction form
    34.48/47.68 = 31.76/x
  3. Step 3: Cross multiply
    34.48x = 47.68 × 31.76
  4. Step 4: Simplify right side
    34.48x = 1,514.32
  5. Step 5: Solve for x
    x = 1,514.32/34.48
  6. Step 6: Final answer
    x = 43.92

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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.