Home / 39,689.78-54,772.61-21,786.45

Finding the Fourth Proportional to 39,689.78, 54,772.61 and 21,786.45

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Solution

The fourth proportional to 39,689.78, 54,772.61 and 21,786.45 is: 30,065.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,689.78 : 54,772.61 = 21,786.45 : x
  2. Step 2: Convert to fraction form
    39,689.78/54,772.61 = 21,786.45/x
  3. Step 3: Cross multiply
    39,689.78x = 54,772.61 × 21,786.45
  4. Step 4: Simplify right side
    39,689.78x = 1,193,300,722.90
  5. Step 5: Solve for x
    x = 1,193,300,722.90/39,689.78
  6. Step 6: Final answer
    x = 30,065.69

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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.