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Finding the Fourth Proportional to 67,394, 101,086.84 and 20,643.28

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Solution

The fourth proportional to 67,394, 101,086.84 and 20,643.28 is: 30,963.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,394 : 101,086.84 = 20,643.28 : x
  2. Step 2: Convert to fraction form
    67,394/101,086.84 = 20,643.28/x
  3. Step 3: Cross multiply
    67,394x = 101,086.84 × 20,643.28
  4. Step 4: Simplify right side
    67,394x = 2,086,763,942.44
  5. Step 5: Solve for x
    x = 2,086,763,942.44/67,394
  6. Step 6: Final answer
    x = 30,963.65

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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.