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Finding the Fourth Proportional to 13.78, 19 and 8.92

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Solution

The fourth proportional to 13.78, 19 and 8.92 is: 12.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    13.78 : 19 = 8.92 : x
  2. Step 2: Convert to fraction form
    13.78/19 = 8.92/x
  3. Step 3: Cross multiply
    13.78x = 19 × 8.92
  4. Step 4: Simplify right side
    13.78x = 169.48
  5. Step 5: Solve for x
    x = 169.48/13.78
  6. Step 6: Final answer
    x = 12.30

Related Problems

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.