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Finding the Fourth Proportional to 39,703.34, 54,789.92 and 21,798.21

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Solution

The fourth proportional to 39,703.34, 54,789.92 and 21,798.21 is: 30,081.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,703.34 : 54,789.92 = 21,798.21 : x
  2. Step 2: Convert to fraction form
    39,703.34/54,789.92 = 21,798.21/x
  3. Step 3: Cross multiply
    39,703.34x = 54,789.92 × 21,798.21
  4. Step 4: Simplify right side
    39,703.34x = 1,194,322,073.05
  5. Step 5: Solve for x
    x = 1,194,322,073.05/39,703.34
  6. Step 6: Final answer
    x = 30,081.15

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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.