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Finding the Fourth Proportional to 689.96, 951.92 and 395.16

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Solution

The fourth proportional to 689.96, 951.92 and 395.16 is: 545.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.96 : 951.92 = 395.16 : x
  2. Step 2: Convert to fraction form
    689.96/951.92 = 395.16/x
  3. Step 3: Cross multiply
    689.96x = 951.92 × 395.16
  4. Step 4: Simplify right side
    689.96x = 376,160.71
  5. Step 5: Solve for x
    x = 376,160.71/689.96
  6. Step 6: Final answer
    x = 545.19

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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.