Home / 20,638.80-28,486.08-13,565.88

Finding the Fourth Proportional to 20,638.80, 28,486.08 and 13,565.88

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Solution

The fourth proportional to 20,638.80, 28,486.08 and 13,565.88 is: 18,723.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,638.80 : 28,486.08 = 13,565.88 : x
  2. Step 2: Convert to fraction form
    20,638.80/28,486.08 = 13,565.88/x
  3. Step 3: Cross multiply
    20,638.80x = 28,486.08 × 13,565.88
  4. Step 4: Simplify right side
    20,638.80x = 386,438,742.95
  5. Step 5: Solve for x
    x = 386,438,742.95/20,638.80
  6. Step 6: Final answer
    x = 18,723.90

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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.