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Finding the Fourth Proportional to 8.43, 12.57 and 8.28

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Solution

The fourth proportional to 8.43, 12.57 and 8.28 is: 12.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    8.43 : 12.57 = 8.28 : x
  2. Step 2: Convert to fraction form
    8.43/12.57 = 8.28/x
  3. Step 3: Cross multiply
    8.43x = 12.57 × 8.28
  4. Step 4: Simplify right side
    8.43x = 104.08
  5. Step 5: Solve for x
    x = 104.08/8.43
  6. Step 6: Final answer
    x = 12.35

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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.