Home / 81,843.12-122,767.16-31,921.20

Finding the Fourth Proportional to 81,843.12, 122,767.16 and 31,921.20

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Solution

The fourth proportional to 81,843.12, 122,767.16 and 31,921.20 is: 47,882.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,843.12 : 122,767.16 = 31,921.20 : x
  2. Step 2: Convert to fraction form
    81,843.12/122,767.16 = 31,921.20/x
  3. Step 3: Cross multiply
    81,843.12x = 122,767.16 × 31,921.20
  4. Step 4: Simplify right side
    81,843.12x = 3,918,874,908.19
  5. Step 5: Solve for x
    x = 3,918,874,908.19/81,843.12
  6. Step 6: Final answer
    x = 47,882.77

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.