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Finding the Fourth Proportional to 77,040.80, 115,599.60 and 43,786.40

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Solution

The fourth proportional to 77,040.80, 115,599.60 and 43,786.40 is: 65,701.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,040.80 : 115,599.60 = 43,786.40 : x
  2. Step 2: Convert to fraction form
    77,040.80/115,599.60 = 43,786.40/x
  3. Step 3: Cross multiply
    77,040.80x = 115,599.60 × 43,786.40
  4. Step 4: Simplify right side
    77,040.80x = 5,061,690,325.44
  5. Step 5: Solve for x
    x = 5,061,690,325.44/77,040.80
  6. Step 6: Final answer
    x = 65,701.42

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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.