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Finding the Fourth Proportional to 79,129.50, 109,198.69 and 43,319.40

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Solution

The fourth proportional to 79,129.50, 109,198.69 and 43,319.40 is: 59,780.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,129.50 : 109,198.69 = 43,319.40 : x
  2. Step 2: Convert to fraction form
    79,129.50/109,198.69 = 43,319.40/x
  3. Step 3: Cross multiply
    79,129.50x = 109,198.69 × 43,319.40
  4. Step 4: Simplify right side
    79,129.50x = 4,730,421,731.59
  5. Step 5: Solve for x
    x = 4,730,421,731.59/79,129.50
  6. Step 6: Final answer
    x = 59,780.76

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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.