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Finding the Fourth Proportional to 3,418.70, 5,128.05 and 3,148.70

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Solution

The fourth proportional to 3,418.70, 5,128.05 and 3,148.70 is: 4,723.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,418.70 : 5,128.05 = 3,148.70 : x
  2. Step 2: Convert to fraction form
    3,418.70/5,128.05 = 3,148.70/x
  3. Step 3: Cross multiply
    3,418.70x = 5,128.05 × 3,148.70
  4. Step 4: Simplify right side
    3,418.70x = 16,146,691.04
  5. Step 5: Solve for x
    x = 16,146,691.04/3,418.70
  6. Step 6: Final answer
    x = 4,723.05

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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.