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Finding the Fourth Proportional to 641.35, 961.75 and 436.02

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Solution

The fourth proportional to 641.35, 961.75 and 436.02 is: 653.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.35 : 961.75 = 436.02 : x
  2. Step 2: Convert to fraction form
    641.35/961.75 = 436.02/x
  3. Step 3: Cross multiply
    641.35x = 961.75 × 436.02
  4. Step 4: Simplify right side
    641.35x = 419,342.24
  5. Step 5: Solve for x
    x = 419,342.24/641.35
  6. Step 6: Final answer
    x = 653.84

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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.