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Finding the Fourth Proportional to 698.34, 963.54 and 387.84

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Solution

The fourth proportional to 698.34, 963.54 and 387.84 is: 535.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    698.34 : 963.54 = 387.84 : x
  2. Step 2: Convert to fraction form
    698.34/963.54 = 387.84/x
  3. Step 3: Cross multiply
    698.34x = 963.54 × 387.84
  4. Step 4: Simplify right side
    698.34x = 373,699.35
  5. Step 5: Solve for x
    x = 373,699.35/698.34
  6. Step 6: Final answer
    x = 535.13

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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.