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Finding the Fourth Proportional to 689.91, 951.72 and 440.97

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Solution

The fourth proportional to 689.91, 951.72 and 440.97 is: 608.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.91 : 951.72 = 440.97 : x
  2. Step 2: Convert to fraction form
    689.91/951.72 = 440.97/x
  3. Step 3: Cross multiply
    689.91x = 951.72 × 440.97
  4. Step 4: Simplify right side
    689.91x = 419,679.97
  5. Step 5: Solve for x
    x = 419,679.97/689.91
  6. Step 6: Final answer
    x = 608.31

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.