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Finding the Fourth Proportional to 12.95, 19.42 and 9.91

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Solution

The fourth proportional to 12.95, 19.42 and 9.91 is: 14.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    12.95 : 19.42 = 9.91 : x
  2. Step 2: Convert to fraction form
    12.95/19.42 = 9.91/x
  3. Step 3: Cross multiply
    12.95x = 19.42 × 9.91
  4. Step 4: Simplify right side
    12.95x = 192.38
  5. Step 5: Solve for x
    x = 192.38/12.95
  6. Step 6: Final answer
    x = 14.86

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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.