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Finding the Fourth Proportional to 347.40, 518.96 and 345.72

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Solution

The fourth proportional to 347.40, 518.96 and 345.72 is: 516.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    347.40 : 518.96 = 345.72 : x
  2. Step 2: Convert to fraction form
    347.40/518.96 = 345.72/x
  3. Step 3: Cross multiply
    347.40x = 518.96 × 345.72
  4. Step 4: Simplify right side
    347.40x = 179,414.85
  5. Step 5: Solve for x
    x = 179,414.85/347.40
  6. Step 6: Final answer
    x = 516.45

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.