Home / 39,689.12-54,771.68-21,785.80

Finding the Fourth Proportional to 39,689.12, 54,771.68 and 21,785.80

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Solution

The fourth proportional to 39,689.12, 54,771.68 and 21,785.80 is: 30,064.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,689.12 : 54,771.68 = 21,785.80 : x
  2. Step 2: Convert to fraction form
    39,689.12/54,771.68 = 21,785.80/x
  3. Step 3: Cross multiply
    39,689.12x = 54,771.68 × 21,785.80
  4. Step 4: Simplify right side
    39,689.12x = 1,193,244,866.14
  5. Step 5: Solve for x
    x = 1,193,244,866.14/39,689.12
  6. Step 6: Final answer
    x = 30,064.79

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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.