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Finding the Fourth Proportional to 77,104.80, 115,657.20 and 39,664.80

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Solution

The fourth proportional to 77,104.80, 115,657.20 and 39,664.80 is: 59,497.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,104.80 : 115,657.20 = 39,664.80 : x
  2. Step 2: Convert to fraction form
    77,104.80/115,657.20 = 39,664.80/x
  3. Step 3: Cross multiply
    77,104.80x = 115,657.20 × 39,664.80
  4. Step 4: Simplify right side
    77,104.80x = 4,587,519,706.56
  5. Step 5: Solve for x
    x = 4,587,519,706.56/77,104.80
  6. Step 6: Final answer
    x = 59,497.20

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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.