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Finding the Fourth Proportional to 71,987,805.60, 107,981,708.40 and 66,445,072.80

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Solution

The fourth proportional to 71,987,805.60, 107,981,708.40 and 66,445,072.80 is: 99,667,609.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,987,805.60 : 107,981,708.40 = 66,445,072.80 : x
  2. Step 2: Convert to fraction form
    71,987,805.60/107,981,708.40 = 66,445,072.80/x
  3. Step 3: Cross multiply
    71,987,805.60x = 107,981,708.40 × 66,445,072.80
  4. Step 4: Simplify right side
    71,987,805.60x = 7,174,852,475,706,372
  5. Step 5: Solve for x
    x = 7,174,852,475,706,372/71,987,805.60
  6. Step 6: Final answer
    x = 99,667,609.20

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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.