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Finding the Fourth Proportional to 1,141.44, 1,575.05 and 644.09

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Solution

The fourth proportional to 1,141.44, 1,575.05 and 644.09 is: 888.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,141.44 : 1,575.05 = 644.09 : x
  2. Step 2: Convert to fraction form
    1,141.44/1,575.05 = 644.09/x
  3. Step 3: Cross multiply
    1,141.44x = 1,575.05 × 644.09
  4. Step 4: Simplify right side
    1,141.44x = 1,014,462.86
  5. Step 5: Solve for x
    x = 1,014,462.86/1,141.44
  6. Step 6: Final answer
    x = 888.76

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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.