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Finding the Fourth Proportional to 722.90, 998.02 and 556.78

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Solution

The fourth proportional to 722.90, 998.02 and 556.78 is: 768.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    722.90 : 998.02 = 556.78 : x
  2. Step 2: Convert to fraction form
    722.90/998.02 = 556.78/x
  3. Step 3: Cross multiply
    722.90x = 998.02 × 556.78
  4. Step 4: Simplify right side
    722.90x = 555,677.58
  5. Step 5: Solve for x
    x = 555,677.58/722.90
  6. Step 6: Final answer
    x = 768.68

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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.