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Finding the Fourth Proportional to 1,107.72, 1,659.96 and 644.81

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Solution

The fourth proportional to 1,107.72, 1,659.96 and 644.81 is: 966.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,107.72 : 1,659.96 = 644.81 : x
  2. Step 2: Convert to fraction form
    1,107.72/1,659.96 = 644.81/x
  3. Step 3: Cross multiply
    1,107.72x = 1,659.96 × 644.81
  4. Step 4: Simplify right side
    1,107.72x = 1,070,350.51
  5. Step 5: Solve for x
    x = 1,070,350.51/1,107.72
  6. Step 6: Final answer
    x = 966.26

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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.