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Finding the Fourth Proportional to 72,320.28, 99,805.74 and 40,487.28

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Solution

The fourth proportional to 72,320.28, 99,805.74 and 40,487.28 is: 55,874.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,320.28 : 99,805.74 = 40,487.28 : x
  2. Step 2: Convert to fraction form
    72,320.28/99,805.74 = 40,487.28/x
  3. Step 3: Cross multiply
    72,320.28x = 99,805.74 × 40,487.28
  4. Step 4: Simplify right side
    72,320.28x = 4,040,862,940.99
  5. Step 5: Solve for x
    x = 4,040,862,940.99/72,320.28
  6. Step 6: Final answer
    x = 55,874.55

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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.