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Finding the Fourth Proportional to 641.10, 961.65 and 446.70

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Solution

The fourth proportional to 641.10, 961.65 and 446.70 is: 670.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.10 : 961.65 = 446.70 : x
  2. Step 2: Convert to fraction form
    641.10/961.65 = 446.70/x
  3. Step 3: Cross multiply
    641.10x = 961.65 × 446.70
  4. Step 4: Simplify right side
    641.10x = 429,569.06
  5. Step 5: Solve for x
    x = 429,569.06/641.10
  6. Step 6: Final answer
    x = 670.05

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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.