Home / 15,135.85-20,887.41-8,422.12

Finding the Fourth Proportional to 15,135.85, 20,887.41 and 8,422.12

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Solution

The fourth proportional to 15,135.85, 20,887.41 and 8,422.12 is: 11,622.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,135.85 : 20,887.41 = 8,422.12 : x
  2. Step 2: Convert to fraction form
    15,135.85/20,887.41 = 8,422.12/x
  3. Step 3: Cross multiply
    15,135.85x = 20,887.41 × 8,422.12
  4. Step 4: Simplify right side
    15,135.85x = 175,916,273.51
  5. Step 5: Solve for x
    x = 175,916,273.51/15,135.85
  6. Step 6: Final answer
    x = 11,622.49

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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.