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Finding the Fourth Proportional to 722.88, 998 and 556.80

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Solution

The fourth proportional to 722.88, 998 and 556.80 is: 768.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    722.88 : 998 = 556.80 : x
  2. Step 2: Convert to fraction form
    722.88/998 = 556.80/x
  3. Step 3: Cross multiply
    722.88x = 998 × 556.80
  4. Step 4: Simplify right side
    722.88x = 555,686.40
  5. Step 5: Solve for x
    x = 555,686.40/722.88
  6. Step 6: Final answer
    x = 768.71

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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.