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Finding the Fourth Proportional to 639.84, 960.18 and 351.48

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Solution

The fourth proportional to 639.84, 960.18 and 351.48 is: 527.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.84 : 960.18 = 351.48 : x
  2. Step 2: Convert to fraction form
    639.84/960.18 = 351.48/x
  3. Step 3: Cross multiply
    639.84x = 960.18 × 351.48
  4. Step 4: Simplify right side
    639.84x = 337,484.07
  5. Step 5: Solve for x
    x = 337,484.07/639.84
  6. Step 6: Final answer
    x = 527.45

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.