Home / 138,458.07-208,120.64-91,375.72

Finding the Fourth Proportional to 138,458.07, 208,120.64 and 91,375.72

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Solution

The fourth proportional to 138,458.07, 208,120.64 and 91,375.72 is: 137,349.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,458.07 : 208,120.64 = 91,375.72 : x
  2. Step 2: Convert to fraction form
    138,458.07/208,120.64 = 91,375.72/x
  3. Step 3: Cross multiply
    138,458.07x = 208,120.64 × 91,375.72
  4. Step 4: Simplify right side
    138,458.07x = 19,017,172,349.68
  5. Step 5: Solve for x
    x = 19,017,172,349.68/138,458.07
  6. Step 6: Final answer
    x = 137,349.69

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.