Home / 20,643.15-28,487.87-11,211.78

Finding the Fourth Proportional to 20,643.15, 28,487.87 and 11,211.78

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Solution

The fourth proportional to 20,643.15, 28,487.87 and 11,211.78 is: 15,472.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,643.15 : 28,487.87 = 11,211.78 : x
  2. Step 2: Convert to fraction form
    20,643.15/28,487.87 = 11,211.78/x
  3. Step 3: Cross multiply
    20,643.15x = 28,487.87 × 11,211.78
  4. Step 4: Simplify right side
    20,643.15x = 319,399,675.05
  5. Step 5: Solve for x
    x = 319,399,675.05/20,643.15
  6. Step 6: Final answer
    x = 15,472.43

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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.