Home / 100,678.61-138,940.05-55,360.04

Finding the Fourth Proportional to 100,678.61, 138,940.05 and 55,360.04

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Solution

The fourth proportional to 100,678.61, 138,940.05 and 55,360.04 is: 76,398.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,678.61 : 138,940.05 = 55,360.04 : x
  2. Step 2: Convert to fraction form
    100,678.61/138,940.05 = 55,360.04/x
  3. Step 3: Cross multiply
    100,678.61x = 138,940.05 × 55,360.04
  4. Step 4: Simplify right side
    100,678.61x = 7,691,726,448.80
  5. Step 5: Solve for x
    x = 7,691,726,448.80/100,678.61
  6. Step 6: Final answer
    x = 76,398.82

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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.