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Finding the Fourth Proportional to 3,479.78, 5,216.34 and 1,287.92

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Solution

The fourth proportional to 3,479.78, 5,216.34 and 1,287.92 is: 1,930.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,479.78 : 5,216.34 = 1,287.92 : x
  2. Step 2: Convert to fraction form
    3,479.78/5,216.34 = 1,287.92/x
  3. Step 3: Cross multiply
    3,479.78x = 5,216.34 × 1,287.92
  4. Step 4: Simplify right side
    3,479.78x = 6,718,228.61
  5. Step 5: Solve for x
    x = 6,718,228.61/3,479.78
  6. Step 6: Final answer
    x = 1,930.65

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1.5x scale

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.