Home / 15,419.78-21,279.38-8,346.20

Finding the Fourth Proportional to 15,419.78, 21,279.38 and 8,346.20

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Solution

The fourth proportional to 15,419.78, 21,279.38 and 8,346.20 is: 11,517.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,419.78 : 21,279.38 = 8,346.20 : x
  2. Step 2: Convert to fraction form
    15,419.78/21,279.38 = 8,346.20/x
  3. Step 3: Cross multiply
    15,419.78x = 21,279.38 × 8,346.20
  4. Step 4: Simplify right side
    15,419.78x = 177,601,813.23
  5. Step 5: Solve for x
    x = 177,601,813.23/15,419.78
  6. Step 6: Final answer
    x = 11,517.80

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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.