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Finding the Fourth Proportional to 72,218.88, 99,660.21 and 39,952.68

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Solution

The fourth proportional to 72,218.88, 99,660.21 and 39,952.68 is: 55,133.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,218.88 : 99,660.21 = 39,952.68 : x
  2. Step 2: Convert to fraction form
    72,218.88/99,660.21 = 39,952.68/x
  3. Step 3: Cross multiply
    72,218.88x = 99,660.21 × 39,952.68
  4. Step 4: Simplify right side
    72,218.88x = 3,981,692,478.86
  5. Step 5: Solve for x
    x = 3,981,692,478.86/72,218.88
  6. Step 6: Final answer
    x = 55,133.68

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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.