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Finding the Fourth Proportional to 344.30, 516.45 and 317.90

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Solution

The fourth proportional to 344.30, 516.45 and 317.90 is: 476.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    344.30 : 516.45 = 317.90 : x
  2. Step 2: Convert to fraction form
    344.30/516.45 = 317.90/x
  3. Step 3: Cross multiply
    344.30x = 516.45 × 317.90
  4. Step 4: Simplify right side
    344.30x = 164,179.46
  5. Step 5: Solve for x
    x = 164,179.46/344.30
  6. Step 6: Final answer
    x = 476.85

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.