Home / 20,878.29-28,839.65-15,563.88

Finding the Fourth Proportional to 20,878.29, 28,839.65 and 15,563.88

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Solution

The fourth proportional to 20,878.29, 28,839.65 and 15,563.88 is: 21,498.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,878.29 : 28,839.65 = 15,563.88 : x
  2. Step 2: Convert to fraction form
    20,878.29/28,839.65 = 15,563.88/x
  3. Step 3: Cross multiply
    20,878.29x = 28,839.65 × 15,563.88
  4. Step 4: Simplify right side
    20,878.29x = 448,856,774.02
  5. Step 5: Solve for x
    x = 448,856,774.02/20,878.29
  6. Step 6: Final answer
    x = 21,498.73

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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.