Home / 39,678.62-54,757.70-21,774.78

Finding the Fourth Proportional to 39,678.62, 54,757.70 and 21,774.78

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Solution

The fourth proportional to 39,678.62, 54,757.70 and 21,774.78 is: 30,049.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,678.62 : 54,757.70 = 21,774.78 : x
  2. Step 2: Convert to fraction form
    39,678.62/54,757.70 = 21,774.78/x
  3. Step 3: Cross multiply
    39,678.62x = 54,757.70 × 21,774.78
  4. Step 4: Simplify right side
    39,678.62x = 1,192,336,870.81
  5. Step 5: Solve for x
    x = 1,192,336,870.81/39,678.62
  6. Step 6: Final answer
    x = 30,049.86

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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.