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Finding the Fourth Proportional to 393,969,974.48, 591,018,465.72 and 121,340,615.12

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Solution

The fourth proportional to 393,969,974.48, 591,018,465.72 and 121,340,615.12 is: 182,030,481.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,969,974.48 : 591,018,465.72 = 121,340,615.12 : x
  2. Step 2: Convert to fraction form
    393,969,974.48/591,018,465.72 = 121,340,615.12/x
  3. Step 3: Cross multiply
    393,969,974.48x = 591,018,465.72 × 121,340,615.12
  4. Step 4: Simplify right side
    393,969,974.48x = 71,714,544,177,743,440
  5. Step 5: Solve for x
    x = 71,714,544,177,743,440/393,969,974.48
  6. Step 6: Final answer
    x = 182,030,481.57

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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.