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Finding the Fourth Proportional to 155,067.78, 213,967.93 and 91,417.87

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Solution

The fourth proportional to 155,067.78, 213,967.93 and 91,417.87 is: 126,141.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    155,067.78 : 213,967.93 = 91,417.87 : x
  2. Step 2: Convert to fraction form
    155,067.78/213,967.93 = 91,417.87/x
  3. Step 3: Cross multiply
    155,067.78x = 213,967.93 × 91,417.87
  4. Step 4: Simplify right side
    155,067.78x = 19,560,492,408.91
  5. Step 5: Solve for x
    x = 19,560,492,408.91/155,067.78
  6. Step 6: Final answer
    x = 126,141.56

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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.