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Finding the Third Proportional to 30.80 and 47.88

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Solution

The third proportional to 30.80 and 47.88 is: 74.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.80 : 47.88 = 47.88 : x
  2. Step 2: Convert to fraction form
    30.80/47.88 = 47.88/x
  3. Step 3: Cross multiply
    30.80x = 47.88 × 47.88
  4. Step 4: Simplify right side
    30.80x = 2,292.76
  5. Step 5: Solve for x
    x = 2,292.76/30.80
  6. Step 6: Final answer
    x = 74.45

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.