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Finding the Fourth Proportional to 1,141.98, 1,576.02 and 644.66

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Solution

The fourth proportional to 1,141.98, 1,576.02 and 644.66 is: 889.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,141.98 : 1,576.02 = 644.66 : x
  2. Step 2: Convert to fraction form
    1,141.98/1,576.02 = 644.66/x
  3. Step 3: Cross multiply
    1,141.98x = 1,576.02 × 644.66
  4. Step 4: Simplify right side
    1,141.98x = 1,015,997.05
  5. Step 5: Solve for x
    x = 1,015,997.05/1,141.98
  6. Step 6: Final answer
    x = 889.68

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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.