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Finding the Fourth Proportional to 311.28, 429.86 and 266.76

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Solution

The fourth proportional to 311.28, 429.86 and 266.76 is: 368.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.28 : 429.86 = 266.76 : x
  2. Step 2: Convert to fraction form
    311.28/429.86 = 266.76/x
  3. Step 3: Cross multiply
    311.28x = 429.86 × 266.76
  4. Step 4: Simplify right side
    311.28x = 114,669.45
  5. Step 5: Solve for x
    x = 114,669.45/311.28
  6. Step 6: Final answer
    x = 368.38

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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.