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Finding the Fourth Proportional to 641.12, 962.20 and 317.12

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Solution

The fourth proportional to 641.12, 962.20 and 317.12 is: 475.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.12 : 962.20 = 317.12 : x
  2. Step 2: Convert to fraction form
    641.12/962.20 = 317.12/x
  3. Step 3: Cross multiply
    641.12x = 962.20 × 317.12
  4. Step 4: Simplify right side
    641.12x = 305,132.86
  5. Step 5: Solve for x
    x = 305,132.86/641.12
  6. Step 6: Final answer
    x = 475.94

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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.