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Finding the Fourth Proportional to 640.02, 959.70 and 331.80

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Solution

The fourth proportional to 640.02, 959.70 and 331.80 is: 497.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.02 : 959.70 = 331.80 : x
  2. Step 2: Convert to fraction form
    640.02/959.70 = 331.80/x
  3. Step 3: Cross multiply
    640.02x = 959.70 × 331.80
  4. Step 4: Simplify right side
    640.02x = 318,428.46
  5. Step 5: Solve for x
    x = 318,428.46/640.02
  6. Step 6: Final answer
    x = 497.53

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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.