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Finding the Fourth Proportional to 92,231.40, 138,411.90 and 39,678.60

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Solution

The fourth proportional to 92,231.40, 138,411.90 and 39,678.60 is: 59,545.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,231.40 : 138,411.90 = 39,678.60 : x
  2. Step 2: Convert to fraction form
    92,231.40/138,411.90 = 39,678.60/x
  3. Step 3: Cross multiply
    92,231.40x = 138,411.90 × 39,678.60
  4. Step 4: Simplify right side
    92,231.40x = 5,491,990,415.34
  5. Step 5: Solve for x
    x = 5,491,990,415.34/92,231.40
  6. Step 6: Final answer
    x = 59,545.78

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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.