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Finding the Fourth Proportional to 78,993.28, 109,010.62 and 42,694.68

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Solution

The fourth proportional to 78,993.28, 109,010.62 and 42,694.68 is: 58,918.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,993.28 : 109,010.62 = 42,694.68 : x
  2. Step 2: Convert to fraction form
    78,993.28/109,010.62 = 42,694.68/x
  3. Step 3: Cross multiply
    78,993.28x = 109,010.62 × 42,694.68
  4. Step 4: Simplify right side
    78,993.28x = 4,654,173,537.50
  5. Step 5: Solve for x
    x = 4,654,173,537.50/78,993.28
  6. Step 6: Final answer
    x = 58,918.60

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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.