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Finding the Fourth Proportional to 1,385.04, 2,076.39 and 644.27

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Solution

The fourth proportional to 1,385.04, 2,076.39 and 644.27 is: 965.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,385.04 : 2,076.39 = 644.27 : x
  2. Step 2: Convert to fraction form
    1,385.04/2,076.39 = 644.27/x
  3. Step 3: Cross multiply
    1,385.04x = 2,076.39 × 644.27
  4. Step 4: Simplify right side
    1,385.04x = 1,337,754.17
  5. Step 5: Solve for x
    x = 1,337,754.17/1,385.04
  6. Step 6: Final answer
    x = 965.86

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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.