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Finding the Fourth Proportional to 5,309.78, 7,964.92 and 1,612.54

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Solution

The fourth proportional to 5,309.78, 7,964.92 and 1,612.54 is: 2,418.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,309.78 : 7,964.92 = 1,612.54 : x
  2. Step 2: Convert to fraction form
    5,309.78/7,964.92 = 1,612.54/x
  3. Step 3: Cross multiply
    5,309.78x = 7,964.92 × 1,612.54
  4. Step 4: Simplify right side
    5,309.78x = 12,843,752.10
  5. Step 5: Solve for x
    x = 12,843,752.10/5,309.78
  6. Step 6: Final answer
    x = 2,418.89

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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.