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Finding the Fourth Proportional to 743.73, 1,115.64 and 310.92

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Solution

The fourth proportional to 743.73, 1,115.64 and 310.92 is: 466.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    743.73 : 1,115.64 = 310.92 : x
  2. Step 2: Convert to fraction form
    743.73/1,115.64 = 310.92/x
  3. Step 3: Cross multiply
    743.73x = 1,115.64 × 310.92
  4. Step 4: Simplify right side
    743.73x = 346,874.79
  5. Step 5: Solve for x
    x = 346,874.79/743.73
  6. Step 6: Final answer
    x = 466.40

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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.