Home / 20,138.90-30,201.15-7,655.61

Finding the Fourth Proportional to 20,138.90, 30,201.15 and 7,655.61

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Solution

The fourth proportional to 20,138.90, 30,201.15 and 7,655.61 is: 11,480.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,138.90 : 30,201.15 = 7,655.61 : x
  2. Step 2: Convert to fraction form
    20,138.90/30,201.15 = 7,655.61/x
  3. Step 3: Cross multiply
    20,138.90x = 30,201.15 × 7,655.61
  4. Step 4: Simplify right side
    20,138.90x = 231,208,367.91
  5. Step 5: Solve for x
    x = 231,208,367.91/20,138.90
  6. Step 6: Final answer
    x = 11,480.69

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.