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Finding the Fourth Proportional to 828.60, 1,242.87 and 251.47

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Solution

The fourth proportional to 828.60, 1,242.87 and 251.47 is: 377.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    828.60 : 1,242.87 = 251.47 : x
  2. Step 2: Convert to fraction form
    828.60/1,242.87 = 251.47/x
  3. Step 3: Cross multiply
    828.60x = 1,242.87 × 251.47
  4. Step 4: Simplify right side
    828.60x = 312,544.52
  5. Step 5: Solve for x
    x = 312,544.52/828.60
  6. Step 6: Final answer
    x = 377.20

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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.