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Finding the Fourth Proportional to 74,940.84, 112,378.32 and 39,872.16

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Solution

The fourth proportional to 74,940.84, 112,378.32 and 39,872.16 is: 59,790.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,940.84 : 112,378.32 = 39,872.16 : x
  2. Step 2: Convert to fraction form
    74,940.84/112,378.32 = 39,872.16/x
  3. Step 3: Cross multiply
    74,940.84x = 112,378.32 × 39,872.16
  4. Step 4: Simplify right side
    74,940.84x = 4,480,766,355.57
  5. Step 5: Solve for x
    x = 4,480,766,355.57/74,940.84
  6. Step 6: Final answer
    x = 59,790.71

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.