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Finding the Fourth Proportional to 68,021.38, 101,862.37 and 42,985.90

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Solution

The fourth proportional to 68,021.38, 101,862.37 and 42,985.90 is: 64,371.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,021.38 : 101,862.37 = 42,985.90 : x
  2. Step 2: Convert to fraction form
    68,021.38/101,862.37 = 42,985.90/x
  3. Step 3: Cross multiply
    68,021.38x = 101,862.37 × 42,985.90
  4. Step 4: Simplify right side
    68,021.38x = 4,378,645,650.58
  5. Step 5: Solve for x
    x = 4,378,645,650.58/68,021.38
  6. Step 6: Final answer
    x = 64,371.61

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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.