Home / 15,057.89-20,778.08-8,686.56

Finding the Fourth Proportional to 15,057.89, 20,778.08 and 8,686.56

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Solution

The fourth proportional to 15,057.89, 20,778.08 and 8,686.56 is: 11,986.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,057.89 : 20,778.08 = 8,686.56 : x
  2. Step 2: Convert to fraction form
    15,057.89/20,778.08 = 8,686.56/x
  3. Step 3: Cross multiply
    15,057.89x = 20,778.08 × 8,686.56
  4. Step 4: Simplify right side
    15,057.89x = 180,489,995.17
  5. Step 5: Solve for x
    x = 180,489,995.17/15,057.89
  6. Step 6: Final answer
    x = 11,986.41

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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.