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Finding the Fourth Proportional to 19, 28.51 and 8.86

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Solution

The fourth proportional to 19, 28.51 and 8.86 is: 13.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    19 : 28.51 = 8.86 : x
  2. Step 2: Convert to fraction form
    19/28.51 = 8.86/x
  3. Step 3: Cross multiply
    19x = 28.51 × 8.86
  4. Step 4: Simplify right side
    19x = 252.60
  5. Step 5: Solve for x
    x = 252.60/19
  6. Step 6: Final answer
    x = 13.29

Related Problems

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Similar ratio
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1.5x scale

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.