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Finding the Fourth Proportional to 689.69, 951.85 and 395

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Solution

The fourth proportional to 689.69, 951.85 and 395 is: 545.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.69 : 951.85 = 395 : x
  2. Step 2: Convert to fraction form
    689.69/951.85 = 395/x
  3. Step 3: Cross multiply
    689.69x = 951.85 × 395
  4. Step 4: Simplify right side
    689.69x = 375,980.75
  5. Step 5: Solve for x
    x = 375,980.75/689.69
  6. Step 6: Final answer
    x = 545.14

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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.