Home / 20,586.78-28,387.18-13,403.44

Finding the Fourth Proportional to 20,586.78, 28,387.18 and 13,403.44

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Solution

The fourth proportional to 20,586.78, 28,387.18 and 13,403.44 is: 18,482.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,586.78 : 28,387.18 = 13,403.44 : x
  2. Step 2: Convert to fraction form
    20,586.78/28,387.18 = 13,403.44/x
  3. Step 3: Cross multiply
    20,586.78x = 28,387.18 × 13,403.44
  4. Step 4: Simplify right side
    20,586.78x = 380,485,863.90
  5. Step 5: Solve for x
    x = 380,485,863.90/20,586.78
  6. Step 6: Final answer
    x = 18,482.05

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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.