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Finding the Fourth Proportional to 391,484,812.80, 587,208,556.80 and 132,674,649.60

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Solution

The fourth proportional to 391,484,812.80, 587,208,556.80 and 132,674,649.60 is: 199,005,649.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,484,812.80 : 587,208,556.80 = 132,674,649.60 : x
  2. Step 2: Convert to fraction form
    391,484,812.80/587,208,556.80 = 132,674,649.60/x
  3. Step 3: Cross multiply
    391,484,812.80x = 587,208,556.80 × 132,674,649.60
  4. Step 4: Simplify right side
    391,484,812.80x = 77,907,689,515,561,680
  5. Step 5: Solve for x
    x = 77,907,689,515,561,680/391,484,812.80
  6. Step 6: Final answer
    x = 199,005,649.69

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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.