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Finding the Fourth Proportional to 722.78, 997.20 and 442.86

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Solution

The fourth proportional to 722.78, 997.20 and 442.86 is: 611.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    722.78 : 997.20 = 442.86 : x
  2. Step 2: Convert to fraction form
    722.78/997.20 = 442.86/x
  3. Step 3: Cross multiply
    722.78x = 997.20 × 442.86
  4. Step 4: Simplify right side
    722.78x = 441,619.99
  5. Step 5: Solve for x
    x = 441,619.99/722.78
  6. Step 6: Final answer
    x = 611.00

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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.