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Finding the Fourth Proportional to 14.71, 20.28 and 9.85

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Solution

The fourth proportional to 14.71, 20.28 and 9.85 is: 13.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    14.71 : 20.28 = 9.85 : x
  2. Step 2: Convert to fraction form
    14.71/20.28 = 9.85/x
  3. Step 3: Cross multiply
    14.71x = 20.28 × 9.85
  4. Step 4: Simplify right side
    14.71x = 199.71
  5. Step 5: Solve for x
    x = 199.71/14.71
  6. Step 6: Final answer
    x = 13.58

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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.