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Finding the Fourth Proportional to 12.87, 19.15 and 12.83

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Solution

The fourth proportional to 12.87, 19.15 and 12.83 is: 19.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    12.87 : 19.15 = 12.83 : x
  2. Step 2: Convert to fraction form
    12.87/19.15 = 12.83/x
  3. Step 3: Cross multiply
    12.87x = 19.15 × 12.83
  4. Step 4: Simplify right side
    12.87x = 245.57
  5. Step 5: Solve for x
    x = 245.57/12.87
  6. Step 6: Final answer
    x = 19.08

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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.