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Finding the Fourth Proportional to 310.62, 428.28 and 266.28

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Solution

The fourth proportional to 310.62, 428.28 and 266.28 is: 367.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.62 : 428.28 = 266.28 : x
  2. Step 2: Convert to fraction form
    310.62/428.28 = 266.28/x
  3. Step 3: Cross multiply
    310.62x = 428.28 × 266.28
  4. Step 4: Simplify right side
    310.62x = 114,042.40
  5. Step 5: Solve for x
    x = 114,042.40/310.62
  6. Step 6: Final answer
    x = 367.14

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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.