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Finding the Fourth Proportional to 689.68, 951.68 and 394.88

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Solution

The fourth proportional to 689.68, 951.68 and 394.88 is: 544.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.68 : 951.68 = 394.88 : x
  2. Step 2: Convert to fraction form
    689.68/951.68 = 394.88/x
  3. Step 3: Cross multiply
    689.68x = 951.68 × 394.88
  4. Step 4: Simplify right side
    689.68x = 375,799.40
  5. Step 5: Solve for x
    x = 375,799.40/689.68
  6. Step 6: Final answer
    x = 544.89

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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.