Home / 39,685.41-54,765.82-21,780.47

Finding the Fourth Proportional to 39,685.41, 54,765.82 and 21,780.47

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Solution

The fourth proportional to 39,685.41, 54,765.82 and 21,780.47 is: 30,057.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,685.41 : 54,765.82 = 21,780.47 : x
  2. Step 2: Convert to fraction form
    39,685.41/54,765.82 = 21,780.47/x
  3. Step 3: Cross multiply
    39,685.41x = 54,765.82 × 21,780.47
  4. Step 4: Simplify right side
    39,685.41x = 1,192,824,971.26
  5. Step 5: Solve for x
    x = 1,192,824,971.26/39,685.41
  6. Step 6: Final answer
    x = 30,057.02

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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.