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Finding the Fourth Proportional to 615.78, 923.64 and 439.32

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Solution

The fourth proportional to 615.78, 923.64 and 439.32 is: 658.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    615.78 : 923.64 = 439.32 : x
  2. Step 2: Convert to fraction form
    615.78/923.64 = 439.32/x
  3. Step 3: Cross multiply
    615.78x = 923.64 × 439.32
  4. Step 4: Simplify right side
    615.78x = 405,773.52
  5. Step 5: Solve for x
    x = 405,773.52/615.78
  6. Step 6: Final answer
    x = 658.96

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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.