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Finding the Fourth Proportional to 8.62, 12.90 and 8.45

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Solution

The fourth proportional to 8.62, 12.90 and 8.45 is: 12.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    8.62 : 12.90 = 8.45 : x
  2. Step 2: Convert to fraction form
    8.62/12.90 = 8.45/x
  3. Step 3: Cross multiply
    8.62x = 12.90 × 8.45
  4. Step 4: Simplify right side
    8.62x = 109.01
  5. Step 5: Solve for x
    x = 109.01/8.62
  6. Step 6: Final answer
    x = 12.65

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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.