Home / 20,680.80-28,544.04-13,607.88

Finding the Fourth Proportional to 20,680.80, 28,544.04 and 13,607.88

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Solution

The fourth proportional to 20,680.80, 28,544.04 and 13,607.88 is: 18,781.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,680.80 : 28,544.04 = 13,607.88 : x
  2. Step 2: Convert to fraction form
    20,680.80/28,544.04 = 13,607.88/x
  3. Step 3: Cross multiply
    20,680.80x = 28,544.04 × 13,607.88
  4. Step 4: Simplify right side
    20,680.80x = 388,423,871.04
  5. Step 5: Solve for x
    x = 388,423,871.04/20,680.80
  6. Step 6: Final answer
    x = 18,781.86

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.