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Finding the Fourth Proportional to 641.21, 961.21 and 584.15

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Solution

The fourth proportional to 641.21, 961.21 and 584.15 is: 875.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.21 : 961.21 = 584.15 : x
  2. Step 2: Convert to fraction form
    641.21/961.21 = 584.15/x
  3. Step 3: Cross multiply
    641.21x = 961.21 × 584.15
  4. Step 4: Simplify right side
    641.21x = 561,484.56
  5. Step 5: Solve for x
    x = 561,484.56/641.21
  6. Step 6: Final answer
    x = 875.67

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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.