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Finding the Fourth Proportional to 9.12, 12.64 and 8.91

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Solution

The fourth proportional to 9.12, 12.64 and 8.91 is: 12.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    9.12 : 12.64 = 8.91 : x
  2. Step 2: Convert to fraction form
    9.12/12.64 = 8.91/x
  3. Step 3: Cross multiply
    9.12x = 12.64 × 8.91
  4. Step 4: Simplify right side
    9.12x = 112.60
  5. Step 5: Solve for x
    x = 112.60/9.12
  6. Step 6: Final answer
    x = 12.35

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.