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Finding the Fourth Proportional to 12.76, 18.91 and 12.70

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Solution

The fourth proportional to 12.76, 18.91 and 12.70 is: 18.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    12.76 : 18.91 = 12.70 : x
  2. Step 2: Convert to fraction form
    12.76/18.91 = 12.70/x
  3. Step 3: Cross multiply
    12.76x = 18.91 × 12.70
  4. Step 4: Simplify right side
    12.76x = 240.15
  5. Step 5: Solve for x
    x = 240.15/12.76
  6. Step 6: Final answer
    x = 18.82

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Why These Related Problems?

These problems maintain the same ratio (1.48) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.