Home / 13,439.80-20,159.70-8,531.20

Finding the Fourth Proportional to 13,439.80, 20,159.70 and 8,531.20

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Solution

The fourth proportional to 13,439.80, 20,159.70 and 8,531.20 is: 12,796.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,439.80 : 20,159.70 = 8,531.20 : x
  2. Step 2: Convert to fraction form
    13,439.80/20,159.70 = 8,531.20/x
  3. Step 3: Cross multiply
    13,439.80x = 20,159.70 × 8,531.20
  4. Step 4: Simplify right side
    13,439.80x = 171,986,432.64
  5. Step 5: Solve for x
    x = 171,986,432.64/13,439.80
  6. Step 6: Final answer
    x = 12,796.80

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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.