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Finding the Fourth Proportional to 312.71, 431.36 and 242.66

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Solution

The fourth proportional to 312.71, 431.36 and 242.66 is: 334.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.71 : 431.36 = 242.66 : x
  2. Step 2: Convert to fraction form
    312.71/431.36 = 242.66/x
  3. Step 3: Cross multiply
    312.71x = 431.36 × 242.66
  4. Step 4: Simplify right side
    312.71x = 104,673.80
  5. Step 5: Solve for x
    x = 104,673.80/312.71
  6. Step 6: Final answer
    x = 334.73

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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.