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Finding the Fourth Proportional to 689.85, 951.95 and 395.11

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Solution

The fourth proportional to 689.85, 951.95 and 395.11 is: 545.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.85 : 951.95 = 395.11 : x
  2. Step 2: Convert to fraction form
    689.85/951.95 = 395.11/x
  3. Step 3: Cross multiply
    689.85x = 951.95 × 395.11
  4. Step 4: Simplify right side
    689.85x = 376,127.14
  5. Step 5: Solve for x
    x = 376,127.14/689.85
  6. Step 6: Final answer
    x = 545.23

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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.