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Finding the Fourth Proportional to 641.84, 963.18 and 317.21

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Solution

The fourth proportional to 641.84, 963.18 and 317.21 is: 476.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.84 : 963.18 = 317.21 : x
  2. Step 2: Convert to fraction form
    641.84/963.18 = 317.21/x
  3. Step 3: Cross multiply
    641.84x = 963.18 × 317.21
  4. Step 4: Simplify right side
    641.84x = 305,525.51
  5. Step 5: Solve for x
    x = 305,525.51/641.84
  6. Step 6: Final answer
    x = 476.02

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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.