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Finding the Fourth Proportional to 28.14, 42.19 and 12.70

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Solution

The fourth proportional to 28.14, 42.19 and 12.70 is: 19.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.14 : 42.19 = 12.70 : x
  2. Step 2: Convert to fraction form
    28.14/42.19 = 12.70/x
  3. Step 3: Cross multiply
    28.14x = 42.19 × 12.70
  4. Step 4: Simplify right side
    28.14x = 535.81
  5. Step 5: Solve for x
    x = 535.81/28.14
  6. Step 6: Final answer
    x = 19.04

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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.