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Finding the Fourth Proportional to 8.16, 12.30 and 7.83

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Solution

The fourth proportional to 8.16, 12.30 and 7.83 is: 11.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    8.16 : 12.30 = 7.83 : x
  2. Step 2: Convert to fraction form
    8.16/12.30 = 7.83/x
  3. Step 3: Cross multiply
    8.16x = 12.30 × 7.83
  4. Step 4: Simplify right side
    8.16x = 96.31
  5. Step 5: Solve for x
    x = 96.31/8.16
  6. Step 6: Final answer
    x = 11.80

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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.