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Finding the Fourth Proportional to 78,438.75, 108,243.60 and 43,981.19

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Solution

The fourth proportional to 78,438.75, 108,243.60 and 43,981.19 is: 60,692.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,438.75 : 108,243.60 = 43,981.19 : x
  2. Step 2: Convert to fraction form
    78,438.75/108,243.60 = 43,981.19/x
  3. Step 3: Cross multiply
    78,438.75x = 108,243.60 × 43,981.19
  4. Step 4: Simplify right side
    78,438.75x = 4,760,681,796.67
  5. Step 5: Solve for x
    x = 4,760,681,796.67/78,438.75
  6. Step 6: Final answer
    x = 60,692.98

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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.