Home / 100,689.11-138,950.75-55,369.88

Finding the Fourth Proportional to 100,689.11, 138,950.75 and 55,369.88

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Solution

The fourth proportional to 100,689.11, 138,950.75 and 55,369.88 is: 76,410.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,689.11 : 138,950.75 = 55,369.88 : x
  2. Step 2: Convert to fraction form
    100,689.11/138,950.75 = 55,369.88/x
  3. Step 3: Cross multiply
    100,689.11x = 138,950.75 × 55,369.88
  4. Step 4: Simplify right side
    100,689.11x = 7,693,686,076.56
  5. Step 5: Solve for x
    x = 7,693,686,076.56/100,689.11
  6. Step 6: Final answer
    x = 76,410.31

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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.