Home / 20,720.91-28,589.85-13,549.98

Finding the Fourth Proportional to 20,720.91, 28,589.85 and 13,549.98

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Solution

The fourth proportional to 20,720.91, 28,589.85 and 13,549.98 is: 18,695.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,720.91 : 28,589.85 = 13,549.98 : x
  2. Step 2: Convert to fraction form
    20,720.91/28,589.85 = 13,549.98/x
  3. Step 3: Cross multiply
    20,720.91x = 28,589.85 × 13,549.98
  4. Step 4: Simplify right side
    20,720.91x = 387,391,895.70
  5. Step 5: Solve for x
    x = 387,391,895.70/20,720.91
  6. Step 6: Final answer
    x = 18,695.70

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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.