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Finding the Fourth Proportional to 256,891.23, 385,195.37 and 79,348.95

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Solution

The fourth proportional to 256,891.23, 385,195.37 and 79,348.95 is: 118,979.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,891.23 : 385,195.37 = 79,348.95 : x
  2. Step 2: Convert to fraction form
    256,891.23/385,195.37 = 79,348.95/x
  3. Step 3: Cross multiply
    256,891.23x = 385,195.37 × 79,348.95
  4. Step 4: Simplify right side
    256,891.23x = 30,564,847,757.62
  5. Step 5: Solve for x
    x = 30,564,847,757.62/256,891.23
  6. Step 6: Final answer
    x = 118,979.72

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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.