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Finding the Fourth Proportional to 639.24, 959.60 and 365.52

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Solution

The fourth proportional to 639.24, 959.60 and 365.52 is: 548.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.24 : 959.60 = 365.52 : x
  2. Step 2: Convert to fraction form
    639.24/959.60 = 365.52/x
  3. Step 3: Cross multiply
    639.24x = 959.60 × 365.52
  4. Step 4: Simplify right side
    639.24x = 350,752.99
  5. Step 5: Solve for x
    x = 350,752.99/639.24
  6. Step 6: Final answer
    x = 548.70

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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.