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Finding the Fourth Proportional to 71,987,870.60, 107,981,805.90 and 66,445,137.80

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Solution

The fourth proportional to 71,987,870.60, 107,981,805.90 and 66,445,137.80 is: 99,667,706.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,987,870.60 : 107,981,805.90 = 66,445,137.80 : x
  2. Step 2: Convert to fraction form
    71,987,870.60/107,981,805.90 = 66,445,137.80/x
  3. Step 3: Cross multiply
    71,987,870.60x = 107,981,805.90 × 66,445,137.80
  4. Step 4: Simplify right side
    71,987,870.60x = 7,174,865,972,918,353
  5. Step 5: Solve for x
    x = 7,174,865,972,918,353/71,987,870.60
  6. Step 6: Final answer
    x = 99,667,706.70

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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.