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Finding the Fourth Proportional to 3,478.72, 5,218.88 and 1,138.80

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Solution

The fourth proportional to 3,478.72, 5,218.88 and 1,138.80 is: 1,708.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,478.72 : 5,218.88 = 1,138.80 : x
  2. Step 2: Convert to fraction form
    3,478.72/5,218.88 = 1,138.80/x
  3. Step 3: Cross multiply
    3,478.72x = 5,218.88 × 1,138.80
  4. Step 4: Simplify right side
    3,478.72x = 5,943,260.54
  5. Step 5: Solve for x
    x = 5,943,260.54/3,478.72
  6. Step 6: Final answer
    x = 1,708.46

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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.