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Finding the Fourth Proportional to 646.64, 969.12 and 261.44

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Solution

The fourth proportional to 646.64, 969.12 and 261.44 is: 391.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    646.64 : 969.12 = 261.44 : x
  2. Step 2: Convert to fraction form
    646.64/969.12 = 261.44/x
  3. Step 3: Cross multiply
    646.64x = 969.12 × 261.44
  4. Step 4: Simplify right side
    646.64x = 253,366.73
  5. Step 5: Solve for x
    x = 253,366.73/646.64
  6. Step 6: Final answer
    x = 391.82

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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.