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Finding the Fourth Proportional to 79,129.55, 118,690.20 and 19,965.74

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Solution

The fourth proportional to 79,129.55, 118,690.20 and 19,965.74 is: 29,947.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,129.55 : 118,690.20 = 19,965.74 : x
  2. Step 2: Convert to fraction form
    79,129.55/118,690.20 = 19,965.74/x
  3. Step 3: Cross multiply
    79,129.55x = 118,690.20 × 19,965.74
  4. Step 4: Simplify right side
    79,129.55x = 2,369,737,080.30
  5. Step 5: Solve for x
    x = 2,369,737,080.30/79,129.55
  6. Step 6: Final answer
    x = 29,947.56

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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.