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Finding the Fourth Proportional to 641.93, 962.72 and 317.21

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Solution

The fourth proportional to 641.93, 962.72 and 317.21 is: 475.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.93 : 962.72 = 317.21 : x
  2. Step 2: Convert to fraction form
    641.93/962.72 = 317.21/x
  3. Step 3: Cross multiply
    641.93x = 962.72 × 317.21
  4. Step 4: Simplify right side
    641.93x = 305,378.01
  5. Step 5: Solve for x
    x = 305,378.01/641.93
  6. Step 6: Final answer
    x = 475.72

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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.