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Finding the Fourth Proportional to 828.60, 1,242.57 and 341.61

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Solution

The fourth proportional to 828.60, 1,242.57 and 341.61 is: 512.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    828.60 : 1,242.57 = 341.61 : x
  2. Step 2: Convert to fraction form
    828.60/1,242.57 = 341.61/x
  3. Step 3: Cross multiply
    828.60x = 1,242.57 × 341.61
  4. Step 4: Simplify right side
    828.60x = 424,474.34
  5. Step 5: Solve for x
    x = 424,474.34/828.60
  6. Step 6: Final answer
    x = 512.28

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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.