Home / 20,580.72-28,401.36-11,149.20

Finding the Fourth Proportional to 20,580.72, 28,401.36 and 11,149.20

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Solution

The fourth proportional to 20,580.72, 28,401.36 and 11,149.20 is: 15,385.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,580.72 : 28,401.36 = 11,149.20 : x
  2. Step 2: Convert to fraction form
    20,580.72/28,401.36 = 11,149.20/x
  3. Step 3: Cross multiply
    20,580.72x = 28,401.36 × 11,149.20
  4. Step 4: Simplify right side
    20,580.72x = 316,652,442.91
  5. Step 5: Solve for x
    x = 316,652,442.91/20,580.72
  6. Step 6: Final answer
    x = 15,385.88

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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.