Home / 26,378.20-36,456.78-21,129.40

Finding the Fourth Proportional to 26,378.20, 36,456.78 and 21,129.40

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Solution

The fourth proportional to 26,378.20, 36,456.78 and 21,129.40 is: 29,202.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    26,378.20 : 36,456.78 = 21,129.40 : x
  2. Step 2: Convert to fraction form
    26,378.20/36,456.78 = 21,129.40/x
  3. Step 3: Cross multiply
    26,378.20x = 36,456.78 × 21,129.40
  4. Step 4: Simplify right side
    26,378.20x = 770,309,887.33
  5. Step 5: Solve for x
    x = 770,309,887.33/26,378.20
  6. Step 6: Final answer
    x = 29,202.52

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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.