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Finding the Fourth Proportional to 689.92, 951.96 and 428

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Solution

The fourth proportional to 689.92, 951.96 and 428 is: 590.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.92 : 951.96 = 428 : x
  2. Step 2: Convert to fraction form
    689.92/951.96 = 428/x
  3. Step 3: Cross multiply
    689.92x = 951.96 × 428
  4. Step 4: Simplify right side
    689.92x = 407,438.88
  5. Step 5: Solve for x
    x = 407,438.88/689.92
  6. Step 6: Final answer
    x = 590.56

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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.