Home / 39,686.40-54,765.52-21,781.71

Finding the Fourth Proportional to 39,686.40, 54,765.52 and 21,781.71

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Solution

The fourth proportional to 39,686.40, 54,765.52 and 21,781.71 is: 30,057.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,686.40 : 54,765.52 = 21,781.71 : x
  2. Step 2: Convert to fraction form
    39,686.40/54,765.52 = 21,781.71/x
  3. Step 3: Cross multiply
    39,686.40x = 54,765.52 × 21,781.71
  4. Step 4: Simplify right side
    39,686.40x = 1,192,886,620.18
  5. Step 5: Solve for x
    x = 1,192,886,620.18/39,686.40
  6. Step 6: Final answer
    x = 30,057.82

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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.