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Finding the Fourth Proportional to 14.47, 21.68 and 7.71

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Solution

The fourth proportional to 14.47, 21.68 and 7.71 is: 11.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    14.47 : 21.68 = 7.71 : x
  2. Step 2: Convert to fraction form
    14.47/21.68 = 7.71/x
  3. Step 3: Cross multiply
    14.47x = 21.68 × 7.71
  4. Step 4: Simplify right side
    14.47x = 167.06
  5. Step 5: Solve for x
    x = 167.06/14.47
  6. Step 6: Final answer
    x = 11.55

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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.