Home / 100,678.24-138,939.54-55,359.69

Finding the Fourth Proportional to 100,678.24, 138,939.54 and 55,359.69

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Solution

The fourth proportional to 100,678.24, 138,939.54 and 55,359.69 is: 76,398.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,678.24 : 138,939.54 = 55,359.69 : x
  2. Step 2: Convert to fraction form
    100,678.24/138,939.54 = 55,359.69/x
  3. Step 3: Cross multiply
    100,678.24x = 138,939.54 × 55,359.69
  4. Step 4: Simplify right side
    100,678.24x = 7,691,649,954.22
  5. Step 5: Solve for x
    x = 7,691,649,954.22/100,678.24
  6. Step 6: Final answer
    x = 76,398.33

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1.5x scale

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.