Home / 20,439.69-28,209.29-11,487

Finding the Fourth Proportional to 20,439.69, 28,209.29 and 11,487

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Solution

The fourth proportional to 20,439.69, 28,209.29 and 11,487 is: 15,853.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,439.69 : 28,209.29 = 11,487 : x
  2. Step 2: Convert to fraction form
    20,439.69/28,209.29 = 11,487/x
  3. Step 3: Cross multiply
    20,439.69x = 28,209.29 × 11,487
  4. Step 4: Simplify right side
    20,439.69x = 324,040,142.95
  5. Step 5: Solve for x
    x = 324,040,142.95/20,439.69
  6. Step 6: Final answer
    x = 15,853.48

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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.