Home / 20,439.81-28,208.25-11,487.69

Finding the Fourth Proportional to 20,439.81, 28,208.25 and 11,487.69

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Solution

The fourth proportional to 20,439.81, 28,208.25 and 11,487.69 is: 15,853.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,439.81 : 28,208.25 = 11,487.69 : x
  2. Step 2: Convert to fraction form
    20,439.81/28,208.25 = 11,487.69/x
  3. Step 3: Cross multiply
    20,439.81x = 28,208.25 × 11,487.69
  4. Step 4: Simplify right side
    20,439.81x = 324,047,631.44
  5. Step 5: Solve for x
    x = 324,047,631.44/20,439.81
  6. Step 6: Final answer
    x = 15,853.75

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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.