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Finding the Fourth Proportional to 91,991,791.80, 137,987,687.70 and 86,323,087.80

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Solution

The fourth proportional to 91,991,791.80, 137,987,687.70 and 86,323,087.80 is: 129,484,631.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,991,791.80 : 137,987,687.70 = 86,323,087.80 : x
  2. Step 2: Convert to fraction form
    91,991,791.80/137,987,687.70 = 86,323,087.80/x
  3. Step 3: Cross multiply
    91,991,791.80x = 137,987,687.70 × 86,323,087.80
  4. Step 4: Simplify right side
    91,991,791.80x = 11,911,523,280,646,078
  5. Step 5: Solve for x
    x = 11,911,523,280,646,078/91,991,791.80
  6. Step 6: Final answer
    x = 129,484,631.70

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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.