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Finding the Fourth Proportional to 807.34, 1,211.34 and 287.44

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Solution

The fourth proportional to 807.34, 1,211.34 and 287.44 is: 431.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    807.34 : 1,211.34 = 287.44 : x
  2. Step 2: Convert to fraction form
    807.34/1,211.34 = 287.44/x
  3. Step 3: Cross multiply
    807.34x = 1,211.34 × 287.44
  4. Step 4: Simplify right side
    807.34x = 348,187.57
  5. Step 5: Solve for x
    x = 348,187.57/807.34
  6. Step 6: Final answer
    x = 431.28

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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.