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Finding the Fourth Proportional to 310.78, 429.18 and 266.26

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Solution

The fourth proportional to 310.78, 429.18 and 266.26 is: 367.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.78 : 429.18 = 266.26 : x
  2. Step 2: Convert to fraction form
    310.78/429.18 = 266.26/x
  3. Step 3: Cross multiply
    310.78x = 429.18 × 266.26
  4. Step 4: Simplify right side
    310.78x = 114,273.47
  5. Step 5: Solve for x
    x = 114,273.47/310.78
  6. Step 6: Final answer
    x = 367.70

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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.