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Finding the Fourth Proportional to 68,139, 94,031.88 and 38,331

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Solution

The fourth proportional to 68,139, 94,031.88 and 38,331 is: 52,896.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,139 : 94,031.88 = 38,331 : x
  2. Step 2: Convert to fraction form
    68,139/94,031.88 = 38,331/x
  3. Step 3: Cross multiply
    68,139x = 94,031.88 × 38,331
  4. Step 4: Simplify right side
    68,139x = 3,604,335,992.28
  5. Step 5: Solve for x
    x = 3,604,335,992.28/68,139
  6. Step 6: Final answer
    x = 52,896.81

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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.