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Finding the Fourth Proportional to 641.31, 960.74 and 315.69

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Solution

The fourth proportional to 641.31, 960.74 and 315.69 is: 472.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.31 : 960.74 = 315.69 : x
  2. Step 2: Convert to fraction form
    641.31/960.74 = 315.69/x
  3. Step 3: Cross multiply
    641.31x = 960.74 × 315.69
  4. Step 4: Simplify right side
    641.31x = 303,296.01
  5. Step 5: Solve for x
    x = 303,296.01/641.31
  6. Step 6: Final answer
    x = 472.93

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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.