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Finding the Fourth Proportional to 72,386.92, 99,903.81 and 40,562.56

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Solution

The fourth proportional to 72,386.92, 99,903.81 and 40,562.56 is: 55,981.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,386.92 : 99,903.81 = 40,562.56 : x
  2. Step 2: Convert to fraction form
    72,386.92/99,903.81 = 40,562.56/x
  3. Step 3: Cross multiply
    72,386.92x = 99,903.81 × 40,562.56
  4. Step 4: Simplify right side
    72,386.92x = 4,052,354,287.35
  5. Step 5: Solve for x
    x = 4,052,354,287.35/72,386.92
  6. Step 6: Final answer
    x = 55,981.86

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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.