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Finding the Fourth Proportional to 72,240, 99,695.62 and 40,411.04

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Solution

The fourth proportional to 72,240, 99,695.62 and 40,411.04 is: 55,769.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,240 : 99,695.62 = 40,411.04 : x
  2. Step 2: Convert to fraction form
    72,240/99,695.62 = 40,411.04/x
  3. Step 3: Cross multiply
    72,240x = 99,695.62 × 40,411.04
  4. Step 4: Simplify right side
    72,240x = 4,028,803,687.64
  5. Step 5: Solve for x
    x = 4,028,803,687.64/72,240
  6. Step 6: Final answer
    x = 55,769.71

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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.