Home / 15,011.46-20,720.34-9,978.66

Finding the Fourth Proportional to 15,011.46, 20,720.34 and 9,978.66

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Solution

The fourth proportional to 15,011.46, 20,720.34 and 9,978.66 is: 13,773.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,011.46 : 20,720.34 = 9,978.66 : x
  2. Step 2: Convert to fraction form
    15,011.46/20,720.34 = 9,978.66/x
  3. Step 3: Cross multiply
    15,011.46x = 20,720.34 × 9,978.66
  4. Step 4: Simplify right side
    15,011.46x = 206,761,227.94
  5. Step 5: Solve for x
    x = 206,761,227.94/15,011.46
  6. Step 6: Final answer
    x = 13,773.56

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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.