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Finding the Fourth Proportional to 415.26, 623.91 and 261.50

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Solution

The fourth proportional to 415.26, 623.91 and 261.50 is: 392.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    415.26 : 623.91 = 261.50 : x
  2. Step 2: Convert to fraction form
    415.26/623.91 = 261.50/x
  3. Step 3: Cross multiply
    415.26x = 623.91 × 261.50
  4. Step 4: Simplify right side
    415.26x = 163,149.35
  5. Step 5: Solve for x
    x = 163,149.35/415.26
  6. Step 6: Final answer
    x = 392.88

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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.