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Finding the Fourth Proportional to 9.29, 12.80 and 7.83

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Solution

The fourth proportional to 9.29, 12.80 and 7.83 is: 10.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    9.29 : 12.80 = 7.83 : x
  2. Step 2: Convert to fraction form
    9.29/12.80 = 7.83/x
  3. Step 3: Cross multiply
    9.29x = 12.80 × 7.83
  4. Step 4: Simplify right side
    9.29x = 100.18
  5. Step 5: Solve for x
    x = 100.18/9.29
  6. Step 6: Final answer
    x = 10.79

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.