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Finding the Fourth Proportional to 8.55, 12.84 and 4.56

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Solution

The fourth proportional to 8.55, 12.84 and 4.56 is: 6.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    8.55 : 12.84 = 4.56 : x
  2. Step 2: Convert to fraction form
    8.55/12.84 = 4.56/x
  3. Step 3: Cross multiply
    8.55x = 12.84 × 4.56
  4. Step 4: Simplify right side
    8.55x = 58.55
  5. Step 5: Solve for x
    x = 58.55/8.55
  6. Step 6: Final answer
    x = 6.85

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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.