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Finding the Fourth Proportional to 78,618.48, 108,481.29 and 45,078

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Solution

The fourth proportional to 78,618.48, 108,481.29 and 45,078 is: 62,200.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,618.48 : 108,481.29 = 45,078 : x
  2. Step 2: Convert to fraction form
    78,618.48/108,481.29 = 45,078/x
  3. Step 3: Cross multiply
    78,618.48x = 108,481.29 × 45,078
  4. Step 4: Simplify right side
    78,618.48x = 4,890,119,590.62
  5. Step 5: Solve for x
    x = 4,890,119,590.62/78,618.48
  6. Step 6: Final answer
    x = 62,200.64

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.