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Finding the Fourth Proportional to 310.88, 429 and 222.56

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Solution

The fourth proportional to 310.88, 429 and 222.56 is: 307.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.88 : 429 = 222.56 : x
  2. Step 2: Convert to fraction form
    310.88/429 = 222.56/x
  3. Step 3: Cross multiply
    310.88x = 429 × 222.56
  4. Step 4: Simplify right side
    310.88x = 95,478.24
  5. Step 5: Solve for x
    x = 95,478.24/310.88
  6. Step 6: Final answer
    x = 307.12

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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.