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Finding the Fourth Proportional to 72,288.95, 99,749.88 and 40,021.11

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Solution

The fourth proportional to 72,288.95, 99,749.88 and 40,021.11 is: 55,224.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,288.95 : 99,749.88 = 40,021.11 : x
  2. Step 2: Convert to fraction form
    72,288.95/99,749.88 = 40,021.11/x
  3. Step 3: Cross multiply
    72,288.95x = 99,749.88 × 40,021.11
  4. Step 4: Simplify right side
    72,288.95x = 3,992,100,919.97
  5. Step 5: Solve for x
    x = 3,992,100,919.97/72,288.95
  6. Step 6: Final answer
    x = 55,224.22

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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.