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Finding the Fourth Proportional to 662.05, 912.81 and 621.96

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Solution

The fourth proportional to 662.05, 912.81 and 621.96 is: 857.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    662.05 : 912.81 = 621.96 : x
  2. Step 2: Convert to fraction form
    662.05/912.81 = 621.96/x
  3. Step 3: Cross multiply
    662.05x = 912.81 × 621.96
  4. Step 4: Simplify right side
    662.05x = 567,731.31
  5. Step 5: Solve for x
    x = 567,731.31/662.05
  6. Step 6: Final answer
    x = 857.54

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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.