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Finding the Fourth Proportional to 18.70, 28 and 14.17

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Solution

The fourth proportional to 18.70, 28 and 14.17 is: 21.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.70 : 28 = 14.17 : x
  2. Step 2: Convert to fraction form
    18.70/28 = 14.17/x
  3. Step 3: Cross multiply
    18.70x = 28 × 14.17
  4. Step 4: Simplify right side
    18.70x = 396.76
  5. Step 5: Solve for x
    x = 396.76/18.70
  6. Step 6: Final answer
    x = 21.22

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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.