Home / 20,917.78-28,868.08-12,961.56

Finding the Fourth Proportional to 20,917.78, 28,868.08 and 12,961.56

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Solution

The fourth proportional to 20,917.78, 28,868.08 and 12,961.56 is: 17,887.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,917.78 : 28,868.08 = 12,961.56 : x
  2. Step 2: Convert to fraction form
    20,917.78/28,868.08 = 12,961.56/x
  3. Step 3: Cross multiply
    20,917.78x = 28,868.08 × 12,961.56
  4. Step 4: Simplify right side
    20,917.78x = 374,175,258.95
  5. Step 5: Solve for x
    x = 374,175,258.95/20,917.78
  6. Step 6: Final answer
    x = 17,887.90

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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.