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Finding the Fourth Proportional to 61,229,987.20, 91,719,009.60 and 30,954,908.80

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Solution

The fourth proportional to 61,229,987.20, 91,719,009.60 and 30,954,908.80 is: 46,368,678.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,229,987.20 : 91,719,009.60 = 30,954,908.80 : x
  2. Step 2: Convert to fraction form
    61,229,987.20/91,719,009.60 = 30,954,908.80/x
  3. Step 3: Cross multiply
    61,229,987.20x = 91,719,009.60 × 30,954,908.80
  4. Step 4: Simplify right side
    61,229,987.20x = 2,839,153,577,394,324.50
  5. Step 5: Solve for x
    x = 2,839,153,577,394,324.50/61,229,987.20
  6. Step 6: Final answer
    x = 46,368,678.28

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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.