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Finding the Fourth Proportional to 103,859.30, 155,815.19 and 28,979.39

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Solution

The fourth proportional to 103,859.30, 155,815.19 and 28,979.39 is: 43,476.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,859.30 : 155,815.19 = 28,979.39 : x
  2. Step 2: Convert to fraction form
    103,859.30/155,815.19 = 28,979.39/x
  3. Step 3: Cross multiply
    103,859.30x = 155,815.19 × 28,979.39
  4. Step 4: Simplify right side
    103,859.30x = 4,515,429,014.04
  5. Step 5: Solve for x
    x = 4,515,429,014.04/103,859.30
  6. Step 6: Final answer
    x = 43,476.41

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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.