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Finding the Fourth Proportional to 415.39, 623.45 and 223.15

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Solution

The fourth proportional to 415.39, 623.45 and 223.15 is: 334.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    415.39 : 623.45 = 223.15 : x
  2. Step 2: Convert to fraction form
    415.39/623.45 = 223.15/x
  3. Step 3: Cross multiply
    415.39x = 623.45 × 223.15
  4. Step 4: Simplify right side
    415.39x = 139,121.75
  5. Step 5: Solve for x
    x = 139,121.75/415.39
  6. Step 6: Final answer
    x = 334.92

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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.