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Finding the Fourth Proportional to 722.50, 998.85 and 691.90

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Solution

The fourth proportional to 722.50, 998.85 and 691.90 is: 956.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    722.50 : 998.85 = 691.90 : x
  2. Step 2: Convert to fraction form
    722.50/998.85 = 691.90/x
  3. Step 3: Cross multiply
    722.50x = 998.85 × 691.90
  4. Step 4: Simplify right side
    722.50x = 691,104.32
  5. Step 5: Solve for x
    x = 691,104.32/722.50
  6. Step 6: Final answer
    x = 956.55

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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.