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Finding the Fourth Proportional to 641.79, 960.90 and 485.14

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Solution

The fourth proportional to 641.79, 960.90 and 485.14 is: 726.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.79 : 960.90 = 485.14 : x
  2. Step 2: Convert to fraction form
    641.79/960.90 = 485.14/x
  3. Step 3: Cross multiply
    641.79x = 960.90 × 485.14
  4. Step 4: Simplify right side
    641.79x = 466,166.22
  5. Step 5: Solve for x
    x = 466,166.22/641.79
  6. Step 6: Final answer
    x = 726.35

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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.