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Finding the Fourth Proportional to 828.34, 1,242.70 and 341.40

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Solution

The fourth proportional to 828.34, 1,242.70 and 341.40 is: 512.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    828.34 : 1,242.70 = 341.40 : x
  2. Step 2: Convert to fraction form
    828.34/1,242.70 = 341.40/x
  3. Step 3: Cross multiply
    828.34x = 1,242.70 × 341.40
  4. Step 4: Simplify right side
    828.34x = 424,257.78
  5. Step 5: Solve for x
    x = 424,257.78/828.34
  6. Step 6: Final answer
    x = 512.18

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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.