Home / 39,685.79-54,766.34-21,780.84

Finding the Fourth Proportional to 39,685.79, 54,766.34 and 21,780.84

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Solution

The fourth proportional to 39,685.79, 54,766.34 and 21,780.84 is: 30,057.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,685.79 : 54,766.34 = 21,780.84 : x
  2. Step 2: Convert to fraction form
    39,685.79/54,766.34 = 21,780.84/x
  3. Step 3: Cross multiply
    39,685.79x = 54,766.34 × 21,780.84
  4. Step 4: Simplify right side
    39,685.79x = 1,192,856,780.02
  5. Step 5: Solve for x
    x = 1,192,856,780.02/39,685.79
  6. Step 6: Final answer
    x = 30,057.53

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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.