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Finding the Fourth Proportional to 287.76, 397.14 and 222.24

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Solution

The fourth proportional to 287.76, 397.14 and 222.24 is: 306.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.76 : 397.14 = 222.24 : x
  2. Step 2: Convert to fraction form
    287.76/397.14 = 222.24/x
  3. Step 3: Cross multiply
    287.76x = 397.14 × 222.24
  4. Step 4: Simplify right side
    287.76x = 88,260.39
  5. Step 5: Solve for x
    x = 88,260.39/287.76
  6. Step 6: Final answer
    x = 306.72

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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.