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Finding the Fourth Proportional to 68,086.40, 102,129.60 and 21,339.20

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Solution

The fourth proportional to 68,086.40, 102,129.60 and 21,339.20 is: 32,008.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,086.40 : 102,129.60 = 21,339.20 : x
  2. Step 2: Convert to fraction form
    68,086.40/102,129.60 = 21,339.20/x
  3. Step 3: Cross multiply
    68,086.40x = 102,129.60 × 21,339.20
  4. Step 4: Simplify right side
    68,086.40x = 2,179,363,960.32
  5. Step 5: Solve for x
    x = 2,179,363,960.32/68,086.40
  6. Step 6: Final answer
    x = 32,008.80

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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.