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Finding the Fourth Proportional to 642.06, 960.70 and 382.21

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Solution

The fourth proportional to 642.06, 960.70 and 382.21 is: 571.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.06 : 960.70 = 382.21 : x
  2. Step 2: Convert to fraction form
    642.06/960.70 = 382.21/x
  3. Step 3: Cross multiply
    642.06x = 960.70 × 382.21
  4. Step 4: Simplify right side
    642.06x = 367,189.15
  5. Step 5: Solve for x
    x = 367,189.15/642.06
  6. Step 6: Final answer
    x = 571.89

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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.