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Finding the Fourth Proportional to 415.31, 573.21 and 356.45

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Solution

The fourth proportional to 415.31, 573.21 and 356.45 is: 491.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    415.31 : 573.21 = 356.45 : x
  2. Step 2: Convert to fraction form
    415.31/573.21 = 356.45/x
  3. Step 3: Cross multiply
    415.31x = 573.21 × 356.45
  4. Step 4: Simplify right side
    415.31x = 204,317.84
  5. Step 5: Solve for x
    x = 204,317.84/415.31
  6. Step 6: Final answer
    x = 491.97

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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.