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Finding the Fourth Proportional to 100,578.92, 138,798.96 and 55,259.82

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Solution

The fourth proportional to 100,578.92, 138,798.96 and 55,259.82 is: 76,258.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,578.92 : 138,798.96 = 55,259.82 : x
  2. Step 2: Convert to fraction form
    100,578.92/138,798.96 = 55,259.82/x
  3. Step 3: Cross multiply
    100,578.92x = 138,798.96 × 55,259.82
  4. Step 4: Simplify right side
    100,578.92x = 7,670,005,545.79
  5. Step 5: Solve for x
    x = 7,670,005,545.79/100,578.92
  6. Step 6: Final answer
    x = 76,258.58

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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.