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Finding the Fourth Proportional to 91,991,782.80, 137,987,674.20 and 86,323,078.80

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Solution

The fourth proportional to 91,991,782.80, 137,987,674.20 and 86,323,078.80 is: 129,484,618.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,991,782.80 : 137,987,674.20 = 86,323,078.80 : x
  2. Step 2: Convert to fraction form
    91,991,782.80/137,987,674.20 = 86,323,078.80/x
  3. Step 3: Cross multiply
    91,991,782.80x = 137,987,674.20 × 86,323,078.80
  4. Step 4: Simplify right side
    91,991,782.80x = 11,911,520,873,395,326
  5. Step 5: Solve for x
    x = 11,911,520,873,395,326/91,991,782.80
  6. Step 6: Final answer
    x = 129,484,618.20

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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.