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Finding the Fourth Proportional to 100,963.91, 139,331.16 and 55,643.54

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Solution

The fourth proportional to 100,963.91, 139,331.16 and 55,643.54 is: 76,788.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,963.91 : 139,331.16 = 55,643.54 : x
  2. Step 2: Convert to fraction form
    100,963.91/139,331.16 = 55,643.54/x
  3. Step 3: Cross multiply
    100,963.91x = 139,331.16 × 55,643.54
  4. Step 4: Simplify right side
    100,963.91x = 7,752,878,278.05
  5. Step 5: Solve for x
    x = 7,752,878,278.05/100,963.91
  6. Step 6: Final answer
    x = 76,788.61

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.