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Finding the Fourth Proportional to 355,879.59, 491,099.20 and 212,718.57

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Solution

The fourth proportional to 355,879.59, 491,099.20 and 212,718.57 is: 293,542.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    355,879.59 : 491,099.20 = 212,718.57 : x
  2. Step 2: Convert to fraction form
    355,879.59/491,099.20 = 212,718.57/x
  3. Step 3: Cross multiply
    355,879.59x = 491,099.20 × 212,718.57
  4. Step 4: Simplify right side
    355,879.59x = 104,465,918,488.55
  5. Step 5: Solve for x
    x = 104,465,918,488.55/355,879.59
  6. Step 6: Final answer
    x = 293,542.88

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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.