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Finding the Fourth Proportional to 678.03, 936.11 and 553.98

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Solution

The fourth proportional to 678.03, 936.11 and 553.98 is: 764.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.03 : 936.11 = 553.98 : x
  2. Step 2: Convert to fraction form
    678.03/936.11 = 553.98/x
  3. Step 3: Cross multiply
    678.03x = 936.11 × 553.98
  4. Step 4: Simplify right side
    678.03x = 518,586.22
  5. Step 5: Solve for x
    x = 518,586.22/678.03
  6. Step 6: Final answer
    x = 764.84

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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.