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Finding the Fourth Proportional to 415.05, 623.36 and 261.28

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Solution

The fourth proportional to 415.05, 623.36 and 261.28 is: 392.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    415.05 : 623.36 = 261.28 : x
  2. Step 2: Convert to fraction form
    415.05/623.36 = 261.28/x
  3. Step 3: Cross multiply
    415.05x = 623.36 × 261.28
  4. Step 4: Simplify right side
    415.05x = 162,872.93
  5. Step 5: Solve for x
    x = 162,872.93/415.05
  6. Step 6: Final answer
    x = 392.42

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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.