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Finding the Fourth Proportional to 72,219.92, 99,663.14 and 40,388.94

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Solution

The fourth proportional to 72,219.92, 99,663.14 and 40,388.94 is: 55,736.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,219.92 : 99,663.14 = 40,388.94 : x
  2. Step 2: Convert to fraction form
    72,219.92/99,663.14 = 40,388.94/x
  3. Step 3: Cross multiply
    72,219.92x = 99,663.14 × 40,388.94
  4. Step 4: Simplify right side
    72,219.92x = 4,025,288,682.64
  5. Step 5: Solve for x
    x = 4,025,288,682.64/72,219.92
  6. Step 6: Final answer
    x = 55,736.55

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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.