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Finding the Fourth Proportional to 646.11, 969.10 and 439.21

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Solution

The fourth proportional to 646.11, 969.10 and 439.21 is: 658.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    646.11 : 969.10 = 439.21 : x
  2. Step 2: Convert to fraction form
    646.11/969.10 = 439.21/x
  3. Step 3: Cross multiply
    646.11x = 969.10 × 439.21
  4. Step 4: Simplify right side
    646.11x = 425,634.89
  5. Step 5: Solve for x
    x = 425,634.89/646.11
  6. Step 6: Final answer
    x = 658.77

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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.