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Finding the Fourth Proportional to 649.38, 893.79 and 555.78

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Solution

The fourth proportional to 649.38, 893.79 and 555.78 is: 764.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    649.38 : 893.79 = 555.78 : x
  2. Step 2: Convert to fraction form
    649.38/893.79 = 555.78/x
  3. Step 3: Cross multiply
    649.38x = 893.79 × 555.78
  4. Step 4: Simplify right side
    649.38x = 496,750.61
  5. Step 5: Solve for x
    x = 496,750.61/649.38
  6. Step 6: Final answer
    x = 764.96

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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.