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Finding the Fourth Proportional to 862.79, 1,294.09 and 342.68

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Solution

The fourth proportional to 862.79, 1,294.09 and 342.68 is: 513.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.79 : 1,294.09 = 342.68 : x
  2. Step 2: Convert to fraction form
    862.79/1,294.09 = 342.68/x
  3. Step 3: Cross multiply
    862.79x = 1,294.09 × 342.68
  4. Step 4: Simplify right side
    862.79x = 443,458.76
  5. Step 5: Solve for x
    x = 443,458.76/862.79
  6. Step 6: Final answer
    x = 513.98

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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.