Home / 20,570.42-28,387.32-11,138.98

Finding the Fourth Proportional to 20,570.42, 28,387.32 and 11,138.98

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Solution

The fourth proportional to 20,570.42, 28,387.32 and 11,138.98 is: 15,371.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,570.42 : 28,387.32 = 11,138.98 : x
  2. Step 2: Convert to fraction form
    20,570.42/28,387.32 = 11,138.98/x
  3. Step 3: Cross multiply
    20,570.42x = 28,387.32 × 11,138.98
  4. Step 4: Simplify right side
    20,570.42x = 316,205,734.04
  5. Step 5: Solve for x
    x = 316,205,734.04/20,570.42
  6. Step 6: Final answer
    x = 15,371.87

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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.