Home / 20,331.78-30,318.78-18,716.10

Finding the Fourth Proportional to 20,331.78, 30,318.78 and 18,716.10

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Solution

The fourth proportional to 20,331.78, 30,318.78 and 18,716.10 is: 27,909.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,331.78 : 30,318.78 = 18,716.10 : x
  2. Step 2: Convert to fraction form
    20,331.78/30,318.78 = 18,716.10/x
  3. Step 3: Cross multiply
    20,331.78x = 30,318.78 × 18,716.10
  4. Step 4: Simplify right side
    20,331.78x = 567,449,318.36
  5. Step 5: Solve for x
    x = 567,449,318.36/20,331.78
  6. Step 6: Final answer
    x = 27,909.48

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.