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Finding the Fourth Proportional to 415.65, 621.79 and 347.31

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Solution

The fourth proportional to 415.65, 621.79 and 347.31 is: 519.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    415.65 : 621.79 = 347.31 : x
  2. Step 2: Convert to fraction form
    415.65/621.79 = 347.31/x
  3. Step 3: Cross multiply
    415.65x = 621.79 × 347.31
  4. Step 4: Simplify right side
    415.65x = 215,949.91
  5. Step 5: Solve for x
    x = 215,949.91/415.65
  6. Step 6: Final answer
    x = 519.55

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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.