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Finding the Fourth Proportional to 14.29, 21.55 and 13.17

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Solution

The fourth proportional to 14.29, 21.55 and 13.17 is: 19.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    14.29 : 21.55 = 13.17 : x
  2. Step 2: Convert to fraction form
    14.29/21.55 = 13.17/x
  3. Step 3: Cross multiply
    14.29x = 21.55 × 13.17
  4. Step 4: Simplify right side
    14.29x = 283.81
  5. Step 5: Solve for x
    x = 283.81/14.29
  6. Step 6: Final answer
    x = 19.86

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.