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Finding the Fourth Proportional to 103,979.40, 155,969.10 and 79,403.40

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Solution

The fourth proportional to 103,979.40, 155,969.10 and 79,403.40 is: 119,105.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,979.40 : 155,969.10 = 79,403.40 : x
  2. Step 2: Convert to fraction form
    103,979.40/155,969.10 = 79,403.40/x
  3. Step 3: Cross multiply
    103,979.40x = 155,969.10 × 79,403.40
  4. Step 4: Simplify right side
    103,979.40x = 12,384,476,834.94
  5. Step 5: Solve for x
    x = 12,384,476,834.94/103,979.40
  6. Step 6: Final answer
    x = 119,105.10

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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.