Home / 39,785.12-54,901.40-21,879.66

Finding the Fourth Proportional to 39,785.12, 54,901.40 and 21,879.66

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Solution

The fourth proportional to 39,785.12, 54,901.40 and 21,879.66 is: 30,192.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,785.12 : 54,901.40 = 21,879.66 : x
  2. Step 2: Convert to fraction form
    39,785.12/54,901.40 = 21,879.66/x
  3. Step 3: Cross multiply
    39,785.12x = 54,901.40 × 21,879.66
  4. Step 4: Simplify right side
    39,785.12x = 1,201,223,856.13
  5. Step 5: Solve for x
    x = 1,201,223,856.13/39,785.12
  6. Step 6: Final answer
    x = 30,192.80

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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.