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Finding the Fourth Proportional to 805.27, 1,207.88 and 342.81

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Solution

The fourth proportional to 805.27, 1,207.88 and 342.81 is: 514.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    805.27 : 1,207.88 = 342.81 : x
  2. Step 2: Convert to fraction form
    805.27/1,207.88 = 342.81/x
  3. Step 3: Cross multiply
    805.27x = 1,207.88 × 342.81
  4. Step 4: Simplify right side
    805.27x = 414,077.44
  5. Step 5: Solve for x
    x = 414,077.44/805.27
  6. Step 6: Final answer
    x = 514.21

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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.