Home / 20,570.40-28,387.12-11,138.96

Finding the Fourth Proportional to 20,570.40, 28,387.12 and 11,138.96

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Solution

The fourth proportional to 20,570.40, 28,387.12 and 11,138.96 is: 15,371.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,570.40 : 28,387.12 = 11,138.96 : x
  2. Step 2: Convert to fraction form
    20,570.40/28,387.12 = 11,138.96/x
  3. Step 3: Cross multiply
    20,570.40x = 28,387.12 × 11,138.96
  4. Step 4: Simplify right side
    20,570.40x = 316,202,994.20
  5. Step 5: Solve for x
    x = 316,202,994.20/20,570.40
  6. Step 6: Final answer
    x = 15,371.75

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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.