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Finding the Fourth Proportional to 743.84, 1,115.38 and 275.30

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Solution

The fourth proportional to 743.84, 1,115.38 and 275.30 is: 412.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    743.84 : 1,115.38 = 275.30 : x
  2. Step 2: Convert to fraction form
    743.84/1,115.38 = 275.30/x
  3. Step 3: Cross multiply
    743.84x = 1,115.38 × 275.30
  4. Step 4: Simplify right side
    743.84x = 307,064.11
  5. Step 5: Solve for x
    x = 307,064.11/743.84
  6. Step 6: Final answer
    x = 412.81

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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.