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Finding the Fourth Proportional to 78,912.76, 118,396.82 and 40,943.78

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Solution

The fourth proportional to 78,912.76, 118,396.82 and 40,943.78 is: 61,430.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,912.76 : 118,396.82 = 40,943.78 : x
  2. Step 2: Convert to fraction form
    78,912.76/118,396.82 = 40,943.78/x
  3. Step 3: Cross multiply
    78,912.76x = 118,396.82 × 40,943.78
  4. Step 4: Simplify right side
    78,912.76x = 4,847,612,758.80
  5. Step 5: Solve for x
    x = 4,847,612,758.80/78,912.76
  6. Step 6: Final answer
    x = 61,430.02

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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.