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Finding the Fourth Proportional to 698.43, 963.81 and 387.93

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Solution

The fourth proportional to 698.43, 963.81 and 387.93 is: 535.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    698.43 : 963.81 = 387.93 : x
  2. Step 2: Convert to fraction form
    698.43/963.81 = 387.93/x
  3. Step 3: Cross multiply
    698.43x = 963.81 × 387.93
  4. Step 4: Simplify right side
    698.43x = 373,890.81
  5. Step 5: Solve for x
    x = 373,890.81/698.43
  6. Step 6: Final answer
    x = 535.33

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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.