Home / 100,165.05-138,223.50-54,842.21

Finding the Fourth Proportional to 100,165.05, 138,223.50 and 54,842.21

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Solution

The fourth proportional to 100,165.05, 138,223.50 and 54,842.21 is: 75,679.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,165.05 : 138,223.50 = 54,842.21 : x
  2. Step 2: Convert to fraction form
    100,165.05/138,223.50 = 54,842.21/x
  3. Step 3: Cross multiply
    100,165.05x = 138,223.50 × 54,842.21
  4. Step 4: Simplify right side
    100,165.05x = 7,580,481,939.72
  5. Step 5: Solve for x
    x = 7,580,481,939.72/100,165.05
  6. Step 6: Final answer
    x = 75,679.91

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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.