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Finding the Fourth Proportional to 79,689.83, 109,969.75 and 43,391.90

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Solution

The fourth proportional to 79,689.83, 109,969.75 and 43,391.90 is: 59,879.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,689.83 : 109,969.75 = 43,391.90 : x
  2. Step 2: Convert to fraction form
    79,689.83/109,969.75 = 43,391.90/x
  3. Step 3: Cross multiply
    79,689.83x = 109,969.75 × 43,391.90
  4. Step 4: Simplify right side
    79,689.83x = 4,771,796,724.19
  5. Step 5: Solve for x
    x = 4,771,796,724.19/79,689.83
  6. Step 6: Final answer
    x = 59,879.62

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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.