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Finding the Fourth Proportional to 415.81, 623.82 and 172.41

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Solution

The fourth proportional to 415.81, 623.82 and 172.41 is: 258.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    415.81 : 623.82 = 172.41 : x
  2. Step 2: Convert to fraction form
    415.81/623.82 = 172.41/x
  3. Step 3: Cross multiply
    415.81x = 623.82 × 172.41
  4. Step 4: Simplify right side
    415.81x = 107,552.81
  5. Step 5: Solve for x
    x = 107,552.81/415.81
  6. Step 6: Final answer
    x = 258.66

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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.