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Finding the Fourth Proportional to 391,954,390.80, 587,968,211.12 and 115,605,874.32

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Solution

The fourth proportional to 391,954,390.80, 587,968,211.12 and 115,605,874.32 is: 173,419,613.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,954,390.80 : 587,968,211.12 = 115,605,874.32 : x
  2. Step 2: Convert to fraction form
    391,954,390.80/587,968,211.12 = 115,605,874.32/x
  3. Step 3: Cross multiply
    391,954,390.80x = 587,968,211.12 × 115,605,874.32
  4. Step 4: Simplify right side
    391,954,390.80x = 67,972,579,118,893,944
  5. Step 5: Solve for x
    x = 67,972,579,118,893,944/391,954,390.80
  6. Step 6: Final answer
    x = 173,419,613.90

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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.