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Finding the Fourth Proportional to 646.72, 969.89 and 261.88

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Solution

The fourth proportional to 646.72, 969.89 and 261.88 is: 392.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    646.72 : 969.89 = 261.88 : x
  2. Step 2: Convert to fraction form
    646.72/969.89 = 261.88/x
  3. Step 3: Cross multiply
    646.72x = 969.89 × 261.88
  4. Step 4: Simplify right side
    646.72x = 253,990.60
  5. Step 5: Solve for x
    x = 253,990.60/646.72
  6. Step 6: Final answer
    x = 392.74

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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.