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Finding the Fourth Proportional to 78,648.92, 117,990.90 and 28,728.94

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Solution

The fourth proportional to 78,648.92, 117,990.90 and 28,728.94 is: 43,099.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,648.92 : 117,990.90 = 28,728.94 : x
  2. Step 2: Convert to fraction form
    78,648.92/117,990.90 = 28,728.94/x
  3. Step 3: Cross multiply
    78,648.92x = 117,990.90 × 28,728.94
  4. Step 4: Simplify right side
    78,648.92x = 3,389,753,486.65
  5. Step 5: Solve for x
    x = 3,389,753,486.65/78,648.92
  6. Step 6: Final answer
    x = 43,099.81

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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.