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Finding the Fourth Proportional to 38,909.91, 53,700.78 and 21,917.49

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Solution

The fourth proportional to 38,909.91, 53,700.78 and 21,917.49 is: 30,249.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,909.91 : 53,700.78 = 21,917.49 : x
  2. Step 2: Convert to fraction form
    38,909.91/53,700.78 = 21,917.49/x
  3. Step 3: Cross multiply
    38,909.91x = 53,700.78 × 21,917.49
  4. Step 4: Simplify right side
    38,909.91x = 1,176,986,199.05
  5. Step 5: Solve for x
    x = 1,176,986,199.05/38,909.91
  6. Step 6: Final answer
    x = 30,249.01

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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.