Home / 15,057.90-20,781.36-8,345.70

Finding the Fourth Proportional to 15,057.90, 20,781.36 and 8,345.70

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Solution

The fourth proportional to 15,057.90, 20,781.36 and 8,345.70 is: 11,517.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,057.90 : 20,781.36 = 8,345.70 : x
  2. Step 2: Convert to fraction form
    15,057.90/20,781.36 = 8,345.70/x
  3. Step 3: Cross multiply
    15,057.90x = 20,781.36 × 8,345.70
  4. Step 4: Simplify right side
    15,057.90x = 173,434,996.15
  5. Step 5: Solve for x
    x = 173,434,996.15/15,057.90
  6. Step 6: Final answer
    x = 11,517.87

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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.