Home / 100,431.90-138,604.79-55,118.63

Finding the Fourth Proportional to 100,431.90, 138,604.79 and 55,118.63

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Solution

The fourth proportional to 100,431.90, 138,604.79 and 55,118.63 is: 76,068.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,431.90 : 138,604.79 = 55,118.63 : x
  2. Step 2: Convert to fraction form
    100,431.90/138,604.79 = 55,118.63/x
  3. Step 3: Cross multiply
    100,431.90x = 138,604.79 × 55,118.63
  4. Step 4: Simplify right side
    100,431.90x = 7,639,705,167.62
  5. Step 5: Solve for x
    x = 7,639,705,167.62/100,431.90
  6. Step 6: Final answer
    x = 76,068.51

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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.