Home / 20,575.34-28,394.09-11,143.90

Finding the Fourth Proportional to 20,575.34, 28,394.09 and 11,143.90

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Solution

The fourth proportional to 20,575.34, 28,394.09 and 11,143.90 is: 15,378.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,575.34 : 28,394.09 = 11,143.90 : x
  2. Step 2: Convert to fraction form
    20,575.34/28,394.09 = 11,143.90/x
  3. Step 3: Cross multiply
    20,575.34x = 28,394.09 × 11,143.90
  4. Step 4: Simplify right side
    20,575.34x = 316,420,983.80
  5. Step 5: Solve for x
    x = 316,420,983.80/20,575.34
  6. Step 6: Final answer
    x = 15,378.65

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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.