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Finding the Fourth Proportional to 1,381.64, 2,072.45 and 650.82

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Solution

The fourth proportional to 1,381.64, 2,072.45 and 650.82 is: 976.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,381.64 : 2,072.45 = 650.82 : x
  2. Step 2: Convert to fraction form
    1,381.64/2,072.45 = 650.82/x
  3. Step 3: Cross multiply
    1,381.64x = 2,072.45 × 650.82
  4. Step 4: Simplify right side
    1,381.64x = 1,348,793.54
  5. Step 5: Solve for x
    x = 1,348,793.54/1,381.64
  6. Step 6: Final answer
    x = 976.22

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.