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Finding the Fourth Proportional to 310.88, 429.20 and 206.11

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Solution

The fourth proportional to 310.88, 429.20 and 206.11 is: 284.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.88 : 429.20 = 206.11 : x
  2. Step 2: Convert to fraction form
    310.88/429.20 = 206.11/x
  3. Step 3: Cross multiply
    310.88x = 429.20 × 206.11
  4. Step 4: Simplify right side
    310.88x = 88,462.48
  5. Step 5: Solve for x
    x = 88,462.48/310.88
  6. Step 6: Final answer
    x = 284.55

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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.