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Finding the Fourth Proportional to 18, 26.99 and 8.99

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Solution

The fourth proportional to 18, 26.99 and 8.99 is: 13.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    18 : 26.99 = 8.99 : x
  2. Step 2: Convert to fraction form
    18/26.99 = 8.99/x
  3. Step 3: Cross multiply
    18x = 26.99 × 8.99
  4. Step 4: Simplify right side
    18x = 242.53
  5. Step 5: Solve for x
    x = 242.53/18
  6. Step 6: Final answer
    x = 13.47

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.