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Finding the Fourth Proportional to 287.62, 397.13 and 225.34

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Solution

The fourth proportional to 287.62, 397.13 and 225.34 is: 311.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.62 : 397.13 = 225.34 : x
  2. Step 2: Convert to fraction form
    287.62/397.13 = 225.34/x
  3. Step 3: Cross multiply
    287.62x = 397.13 × 225.34
  4. Step 4: Simplify right side
    287.62x = 89,489.84
  5. Step 5: Solve for x
    x = 89,489.84/287.62
  6. Step 6: Final answer
    x = 311.14

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.