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Finding the Fourth Proportional to 312.30, 431.33 and 250.74

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Solution

The fourth proportional to 312.30, 431.33 and 250.74 is: 346.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.30 : 431.33 = 250.74 : x
  2. Step 2: Convert to fraction form
    312.30/431.33 = 250.74/x
  3. Step 3: Cross multiply
    312.30x = 431.33 × 250.74
  4. Step 4: Simplify right side
    312.30x = 108,150.43
  5. Step 5: Solve for x
    x = 108,150.43/312.30
  6. Step 6: Final answer
    x = 346.30

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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.