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Finding the Fourth Proportional to 828.08, 1,242.12 and 340.79

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Solution

The fourth proportional to 828.08, 1,242.12 and 340.79 is: 511.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    828.08 : 1,242.12 = 340.79 : x
  2. Step 2: Convert to fraction form
    828.08/1,242.12 = 340.79/x
  3. Step 3: Cross multiply
    828.08x = 1,242.12 × 340.79
  4. Step 4: Simplify right side
    828.08x = 423,302.07
  5. Step 5: Solve for x
    x = 423,302.07/828.08
  6. Step 6: Final answer
    x = 511.19

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Double scale
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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.