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Finding the Fourth Proportional to 828.57, 1,242.90 and 251.46

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Solution

The fourth proportional to 828.57, 1,242.90 and 251.46 is: 377.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    828.57 : 1,242.90 = 251.46 : x
  2. Step 2: Convert to fraction form
    828.57/1,242.90 = 251.46/x
  3. Step 3: Cross multiply
    828.57x = 1,242.90 × 251.46
  4. Step 4: Simplify right side
    828.57x = 312,539.63
  5. Step 5: Solve for x
    x = 312,539.63/828.57
  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.