Home / 20,987.80-28,965.20-15,673.39

Finding the Fourth Proportional to 20,987.80, 28,965.20 and 15,673.39

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Solution

The fourth proportional to 20,987.80, 28,965.20 and 15,673.39 is: 21,630.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,987.80 : 28,965.20 = 15,673.39 : x
  2. Step 2: Convert to fraction form
    20,987.80/28,965.20 = 15,673.39/x
  3. Step 3: Cross multiply
    20,987.80x = 28,965.20 × 15,673.39
  4. Step 4: Simplify right side
    20,987.80x = 453,982,842.80
  5. Step 5: Solve for x
    x = 453,982,842.80/20,987.80
  6. Step 6: Final answer
    x = 21,630.80

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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.