Home / 20,108.78-27,749.18-11,156.12

Finding the Fourth Proportional to 20,108.78, 27,749.18 and 11,156.12

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Solution

The fourth proportional to 20,108.78, 27,749.18 and 11,156.12 is: 15,394.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,108.78 : 27,749.18 = 11,156.12 : x
  2. Step 2: Convert to fraction form
    20,108.78/27,749.18 = 11,156.12/x
  3. Step 3: Cross multiply
    20,108.78x = 27,749.18 × 11,156.12
  4. Step 4: Simplify right side
    20,108.78x = 309,573,126.20
  5. Step 5: Solve for x
    x = 309,573,126.20/20,108.78
  6. Step 6: Final answer
    x = 15,394.92

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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.