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Finding the Fourth Proportional to 8.98, 13.55 and 8.69

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Solution

The fourth proportional to 8.98, 13.55 and 8.69 is: 13.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    8.98 : 13.55 = 8.69 : x
  2. Step 2: Convert to fraction form
    8.98/13.55 = 8.69/x
  3. Step 3: Cross multiply
    8.98x = 13.55 × 8.69
  4. Step 4: Simplify right side
    8.98x = 117.75
  5. Step 5: Solve for x
    x = 117.75/8.98
  6. Step 6: Final answer
    x = 13.11

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.