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Finding the Fourth Proportional to 415.40, 623.12 and 278.73

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Solution

The fourth proportional to 415.40, 623.12 and 278.73 is: 418.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    415.40 : 623.12 = 278.73 : x
  2. Step 2: Convert to fraction form
    415.40/623.12 = 278.73/x
  3. Step 3: Cross multiply
    415.40x = 623.12 × 278.73
  4. Step 4: Simplify right side
    415.40x = 173,680.84
  5. Step 5: Solve for x
    x = 173,680.84/415.40
  6. Step 6: Final answer
    x = 418.11

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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.