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Finding the Fourth Proportional to 68,672.60, 103,073.70 and 42,428.60

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Solution

The fourth proportional to 68,672.60, 103,073.70 and 42,428.60 is: 63,682.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,672.60 : 103,073.70 = 42,428.60 : x
  2. Step 2: Convert to fraction form
    68,672.60/103,073.70 = 42,428.60/x
  3. Step 3: Cross multiply
    68,672.60x = 103,073.70 × 42,428.60
  4. Step 4: Simplify right side
    68,672.60x = 4,373,272,787.82
  5. Step 5: Solve for x
    x = 4,373,272,787.82/68,672.60
  6. Step 6: Final answer
    x = 63,682.94

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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.