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Finding the Fourth Proportional to 743.18, 1,115.15 and 304.75

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Solution

The fourth proportional to 743.18, 1,115.15 and 304.75 is: 457.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    743.18 : 1,115.15 = 304.75 : x
  2. Step 2: Convert to fraction form
    743.18/1,115.15 = 304.75/x
  3. Step 3: Cross multiply
    743.18x = 1,115.15 × 304.75
  4. Step 4: Simplify right side
    743.18x = 339,841.96
  5. Step 5: Solve for x
    x = 339,841.96/743.18
  6. Step 6: Final answer
    x = 457.28

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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.