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Finding the Fourth Proportional to 91,609,855.20, 137,414,782.80 and 77,260,948.20

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Solution

The fourth proportional to 91,609,855.20, 137,414,782.80 and 77,260,948.20 is: 115,891,422.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,609,855.20 : 137,414,782.80 = 77,260,948.20 : x
  2. Step 2: Convert to fraction form
    91,609,855.20/137,414,782.80 = 77,260,948.20/x
  3. Step 3: Cross multiply
    91,609,855.20x = 137,414,782.80 × 77,260,948.20
  4. Step 4: Simplify right side
    91,609,855.20x = 10,616,796,415,825,052
  5. Step 5: Solve for x
    x = 10,616,796,415,825,052/91,609,855.20
  6. Step 6: Final answer
    x = 115,891,422.30

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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.