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Finding the Fourth Proportional to 68,139.59, 102,213.71 and 21,394.31

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Solution

The fourth proportional to 68,139.59, 102,213.71 and 21,394.31 is: 32,092.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,139.59 : 102,213.71 = 21,394.31 : x
  2. Step 2: Convert to fraction form
    68,139.59/102,213.71 = 21,394.31/x
  3. Step 3: Cross multiply
    68,139.59x = 102,213.71 × 21,394.31
  4. Step 4: Simplify right side
    68,139.59x = 2,186,791,179.95
  5. Step 5: Solve for x
    x = 2,186,791,179.95/68,139.59
  6. Step 6: Final answer
    x = 32,092.82

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1.5x scale

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.