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Finding the Fourth Proportional to 14.70, 21.89 and 13.18

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Solution

The fourth proportional to 14.70, 21.89 and 13.18 is: 19.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    14.70 : 21.89 = 13.18 : x
  2. Step 2: Convert to fraction form
    14.70/21.89 = 13.18/x
  3. Step 3: Cross multiply
    14.70x = 21.89 × 13.18
  4. Step 4: Simplify right side
    14.70x = 288.49
  5. Step 5: Solve for x
    x = 288.49/14.70
  6. Step 6: Final answer
    x = 19.63

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.