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Finding the Fourth Proportional to 68,128, 94,021.12 and 38,321.92

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Solution

The fourth proportional to 68,128, 94,021.12 and 38,321.92 is: 52,886.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,128 : 94,021.12 = 38,321.92 : x
  2. Step 2: Convert to fraction form
    68,128/94,021.12 = 38,321.92/x
  3. Step 3: Cross multiply
    68,128x = 94,021.12 × 38,321.92
  4. Step 4: Simplify right side
    68,128x = 3,603,069,838.95
  5. Step 5: Solve for x
    x = 3,603,069,838.95/68,128
  6. Step 6: Final answer
    x = 52,886.77

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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.