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Finding the Fourth Proportional to 743.62, 1,115.52 and 310.78

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Solution

The fourth proportional to 743.62, 1,115.52 and 310.78 is: 466.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    743.62 : 1,115.52 = 310.78 : x
  2. Step 2: Convert to fraction form
    743.62/1,115.52 = 310.78/x
  3. Step 3: Cross multiply
    743.62x = 1,115.52 × 310.78
  4. Step 4: Simplify right side
    743.62x = 346,681.31
  5. Step 5: Solve for x
    x = 346,681.31/743.62
  6. Step 6: Final answer
    x = 466.21

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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.