Home / 15,439.69-21,309.85-8,725.40

Finding the Fourth Proportional to 15,439.69, 21,309.85 and 8,725.40

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Solution

The fourth proportional to 15,439.69, 21,309.85 and 8,725.40 is: 12,042.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,439.69 : 21,309.85 = 8,725.40 : x
  2. Step 2: Convert to fraction form
    15,439.69/21,309.85 = 8,725.40/x
  3. Step 3: Cross multiply
    15,439.69x = 21,309.85 × 8,725.40
  4. Step 4: Simplify right side
    15,439.69x = 185,936,965.19
  5. Step 5: Solve for x
    x = 185,936,965.19/15,439.69
  6. Step 6: Final answer
    x = 12,042.79

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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.