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Finding the Fourth Proportional to 172,578,642.40, 258,867,963.60 and 81,879,378.40

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Solution

The fourth proportional to 172,578,642.40, 258,867,963.60 and 81,879,378.40 is: 122,819,067.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,578,642.40 : 258,867,963.60 = 81,879,378.40 : x
  2. Step 2: Convert to fraction form
    172,578,642.40/258,867,963.60 = 81,879,378.40/x
  3. Step 3: Cross multiply
    172,578,642.40x = 258,867,963.60 × 81,879,378.40
  4. Step 4: Simplify right side
    172,578,642.40x = 21,195,947,947,241,828
  5. Step 5: Solve for x
    x = 21,195,947,947,241,828/172,578,642.40
  6. Step 6: Final answer
    x = 122,819,067.60

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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.