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Finding the Fourth Proportional to 415.31, 623.20 and 155.48

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Solution

The fourth proportional to 415.31, 623.20 and 155.48 is: 233.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    415.31 : 623.20 = 155.48 : x
  2. Step 2: Convert to fraction form
    415.31/623.20 = 155.48/x
  3. Step 3: Cross multiply
    415.31x = 623.20 × 155.48
  4. Step 4: Simplify right side
    415.31x = 96,896.31
  5. Step 5: Solve for x
    x = 96,896.31/415.31
  6. Step 6: Final answer
    x = 233.31

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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.