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Finding the Fourth Proportional to 722.77, 997.20 and 407.99

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Solution

The fourth proportional to 722.77, 997.20 and 407.99 is: 562.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    722.77 : 997.20 = 407.99 : x
  2. Step 2: Convert to fraction form
    722.77/997.20 = 407.99/x
  3. Step 3: Cross multiply
    722.77x = 997.20 × 407.99
  4. Step 4: Simplify right side
    722.77x = 406,850.12
  5. Step 5: Solve for x
    x = 406,850.12/722.77
  6. Step 6: Final answer
    x = 562.91

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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.