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Finding the Fourth Proportional to 665.51, 1,003.24 and 620.90

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Solution

The fourth proportional to 665.51, 1,003.24 and 620.90 is: 936.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.51 : 1,003.24 = 620.90 : x
  2. Step 2: Convert to fraction form
    665.51/1,003.24 = 620.90/x
  3. Step 3: Cross multiply
    665.51x = 1,003.24 × 620.90
  4. Step 4: Simplify right side
    665.51x = 622,912.67
  5. Step 5: Solve for x
    x = 622,912.67/665.51
  6. Step 6: Final answer
    x = 936.00

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.