Home / 30,921.12-42,665.94-18,171.72

Finding the Fourth Proportional to 30,921.12, 42,665.94 and 18,171.72

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Solution

The fourth proportional to 30,921.12, 42,665.94 and 18,171.72 is: 25,073.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,921.12 : 42,665.94 = 18,171.72 : x
  2. Step 2: Convert to fraction form
    30,921.12/42,665.94 = 18,171.72/x
  3. Step 3: Cross multiply
    30,921.12x = 42,665.94 × 18,171.72
  4. Step 4: Simplify right side
    30,921.12x = 775,313,515.22
  5. Step 5: Solve for x
    x = 775,313,515.22/30,921.12
  6. Step 6: Final answer
    x = 25,073.91

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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.