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Finding the Fourth Proportional to 719.86, 993.89 and 553.78

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Solution

The fourth proportional to 719.86, 993.89 and 553.78 is: 764.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.86 : 993.89 = 553.78 : x
  2. Step 2: Convert to fraction form
    719.86/993.89 = 553.78/x
  3. Step 3: Cross multiply
    719.86x = 993.89 × 553.78
  4. Step 4: Simplify right side
    719.86x = 550,393.64
  5. Step 5: Solve for x
    x = 550,393.64/719.86
  6. Step 6: Final answer
    x = 764.58

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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.