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Finding the Fourth Proportional to 257,080.60, 385,620.90 and 217,811.80

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Solution

The fourth proportional to 257,080.60, 385,620.90 and 217,811.80 is: 326,717.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    257,080.60 : 385,620.90 = 217,811.80 : x
  2. Step 2: Convert to fraction form
    257,080.60/385,620.90 = 217,811.80/x
  3. Step 3: Cross multiply
    257,080.60x = 385,620.90 × 217,811.80
  4. Step 4: Simplify right side
    257,080.60x = 83,992,782,346.62
  5. Step 5: Solve for x
    x = 83,992,782,346.62/257,080.60
  6. Step 6: Final answer
    x = 326,717.70

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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.