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Finding the Fourth Proportional to 8,689.92, 13,019.46 and 3,139.80

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Solution

The fourth proportional to 8,689.92, 13,019.46 and 3,139.80 is: 4,704.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,689.92 : 13,019.46 = 3,139.80 : x
  2. Step 2: Convert to fraction form
    8,689.92/13,019.46 = 3,139.80/x
  3. Step 3: Cross multiply
    8,689.92x = 13,019.46 × 3,139.80
  4. Step 4: Simplify right side
    8,689.92x = 40,878,500.51
  5. Step 5: Solve for x
    x = 40,878,500.51/8,689.92
  6. Step 6: Final answer
    x = 4,704.13

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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.