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Finding the Fourth Proportional to 698.42, 961.54 and 663.80

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Solution

The fourth proportional to 698.42, 961.54 and 663.80 is: 913.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    698.42 : 961.54 = 663.80 : x
  2. Step 2: Convert to fraction form
    698.42/961.54 = 663.80/x
  3. Step 3: Cross multiply
    698.42x = 961.54 × 663.80
  4. Step 4: Simplify right side
    698.42x = 638,263.78
  5. Step 5: Solve for x
    x = 638,263.78/698.42
  6. Step 6: Final answer
    x = 913.86

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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.