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Finding the Fourth Proportional to 8,418.16, 12,612.16 and 5,129.52

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Solution

The fourth proportional to 8,418.16, 12,612.16 and 5,129.52 is: 7,685.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,418.16 : 12,612.16 = 5,129.52 : x
  2. Step 2: Convert to fraction form
    8,418.16/12,612.16 = 5,129.52/x
  3. Step 3: Cross multiply
    8,418.16x = 12,612.16 × 5,129.52
  4. Step 4: Simplify right side
    8,418.16x = 64,694,326.96
  5. Step 5: Solve for x
    x = 64,694,326.96/8,418.16
  6. Step 6: Final answer
    x = 7,685.09

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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.