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Finding the Fourth Proportional to 100,398.98, 138,552.44 and 55,079.28

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Solution

The fourth proportional to 100,398.98, 138,552.44 and 55,079.28 is: 76,010.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,398.98 : 138,552.44 = 55,079.28 : x
  2. Step 2: Convert to fraction form
    100,398.98/138,552.44 = 55,079.28/x
  3. Step 3: Cross multiply
    100,398.98x = 138,552.44 × 55,079.28
  4. Step 4: Simplify right side
    100,398.98x = 7,631,368,362.05
  5. Step 5: Solve for x
    x = 7,631,368,362.05/100,398.98
  6. Step 6: Final answer
    x = 76,010.42

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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.