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Finding the Fourth Proportional to 69,908.12, 104,862.17 and 19,987.82

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Solution

The fourth proportional to 69,908.12, 104,862.17 and 19,987.82 is: 29,981.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    69,908.12 : 104,862.17 = 19,987.82 : x
  2. Step 2: Convert to fraction form
    69,908.12/104,862.17 = 19,987.82/x
  3. Step 3: Cross multiply
    69,908.12x = 104,862.17 × 19,987.82
  4. Step 4: Simplify right side
    69,908.12x = 2,095,965,704.43
  5. Step 5: Solve for x
    x = 2,095,965,704.43/69,908.12
  6. Step 6: Final answer
    x = 29,981.72

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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.