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Finding the Fourth Proportional to 13,725.80, 20,589.90 and 5,718.80

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Solution

The fourth proportional to 13,725.80, 20,589.90 and 5,718.80 is: 8,578.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,725.80 : 20,589.90 = 5,718.80 : x
  2. Step 2: Convert to fraction form
    13,725.80/20,589.90 = 5,718.80/x
  3. Step 3: Cross multiply
    13,725.80x = 20,589.90 × 5,718.80
  4. Step 4: Simplify right side
    13,725.80x = 117,749,417.17
  5. Step 5: Solve for x
    x = 117,749,417.17/13,725.80
  6. Step 6: Final answer
    x = 8,578.70

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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.