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Finding the Fourth Proportional to 78,972.01, 108,706.74 and 68,882.87

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Solution

The fourth proportional to 78,972.01, 108,706.74 and 68,882.87 is: 94,818.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,972.01 : 108,706.74 = 68,882.87 : x
  2. Step 2: Convert to fraction form
    78,972.01/108,706.74 = 68,882.87/x
  3. Step 3: Cross multiply
    78,972.01x = 108,706.74 × 68,882.87
  4. Step 4: Simplify right side
    78,972.01x = 7,488,032,239.54
  5. Step 5: Solve for x
    x = 7,488,032,239.54/78,972.01
  6. Step 6: Final answer
    x = 94,818.82

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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.