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Finding the Fourth Proportional to 8,689.60, 13,040.80 and 3,499.20

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Solution

The fourth proportional to 8,689.60, 13,040.80 and 3,499.20 is: 5,251.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,689.60 : 13,040.80 = 3,499.20 : x
  2. Step 2: Convert to fraction form
    8,689.60/13,040.80 = 3,499.20/x
  3. Step 3: Cross multiply
    8,689.60x = 13,040.80 × 3,499.20
  4. Step 4: Simplify right side
    8,689.60x = 45,632,367.36
  5. Step 5: Solve for x
    x = 45,632,367.36/8,689.60
  6. Step 6: Final answer
    x = 5,251.38

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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.