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Finding the Fourth Proportional to 8.64, 12.89 and 8.51

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Solution

The fourth proportional to 8.64, 12.89 and 8.51 is: 12.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    8.64 : 12.89 = 8.51 : x
  2. Step 2: Convert to fraction form
    8.64/12.89 = 8.51/x
  3. Step 3: Cross multiply
    8.64x = 12.89 × 8.51
  4. Step 4: Simplify right side
    8.64x = 109.65
  5. Step 5: Solve for x
    x = 109.65/8.64
  6. Step 6: Final answer
    x = 12.69

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.