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Finding the Fourth Proportional to 72,930, 100,643.49 and 39,396

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Solution

The fourth proportional to 72,930, 100,643.49 and 39,396 is: 54,366.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,930 : 100,643.49 = 39,396 : x
  2. Step 2: Convert to fraction form
    72,930/100,643.49 = 39,396/x
  3. Step 3: Cross multiply
    72,930x = 100,643.49 × 39,396
  4. Step 4: Simplify right side
    72,930x = 3,964,950,932.04
  5. Step 5: Solve for x
    x = 3,964,950,932.04/72,930
  6. Step 6: Final answer
    x = 54,366.53

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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.