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Finding the Fourth Proportional to 828.11, 1,242.32 and 340.90

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Solution

The fourth proportional to 828.11, 1,242.32 and 340.90 is: 511.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    828.11 : 1,242.32 = 340.90 : x
  2. Step 2: Convert to fraction form
    828.11/1,242.32 = 340.90/x
  3. Step 3: Cross multiply
    828.11x = 1,242.32 × 340.90
  4. Step 4: Simplify right side
    828.11x = 423,506.89
  5. Step 5: Solve for x
    x = 423,506.89/828.11
  6. Step 6: Final answer
    x = 511.41

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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.