Home / 15,522.78-21,420.72-8,449.20

Finding the Fourth Proportional to 15,522.78, 21,420.72 and 8,449.20

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Solution

The fourth proportional to 15,522.78, 21,420.72 and 8,449.20 is: 11,659.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,522.78 : 21,420.72 = 8,449.20 : x
  2. Step 2: Convert to fraction form
    15,522.78/21,420.72 = 8,449.20/x
  3. Step 3: Cross multiply
    15,522.78x = 21,420.72 × 8,449.20
  4. Step 4: Simplify right side
    15,522.78x = 180,987,947.42
  5. Step 5: Solve for x
    x = 180,987,947.42/15,522.78
  6. Step 6: Final answer
    x = 11,659.51

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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.