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Finding the Fourth Proportional to 892.72, 1,339.19 and 345.38

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Solution

The fourth proportional to 892.72, 1,339.19 and 345.38 is: 518.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    892.72 : 1,339.19 = 345.38 : x
  2. Step 2: Convert to fraction form
    892.72/1,339.19 = 345.38/x
  3. Step 3: Cross multiply
    892.72x = 1,339.19 × 345.38
  4. Step 4: Simplify right side
    892.72x = 462,527.72
  5. Step 5: Solve for x
    x = 462,527.72/892.72
  6. Step 6: Final answer
    x = 518.11

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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.