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Finding the Fourth Proportional to 78,687.72, 118,066.40 and 41,238.84

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Solution

The fourth proportional to 78,687.72, 118,066.40 and 41,238.84 is: 61,876.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,687.72 : 118,066.40 = 41,238.84 : x
  2. Step 2: Convert to fraction form
    78,687.72/118,066.40 = 41,238.84/x
  3. Step 3: Cross multiply
    78,687.72x = 118,066.40 × 41,238.84
  4. Step 4: Simplify right side
    78,687.72x = 4,868,921,378.98
  5. Step 5: Solve for x
    x = 4,868,921,378.98/78,687.72
  6. Step 6: Final answer
    x = 61,876.51

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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.