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Finding the Fourth Proportional to 1,109.64, 1,531.26 and 644.04

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Solution

The fourth proportional to 1,109.64, 1,531.26 and 644.04 is: 888.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,109.64 : 1,531.26 = 644.04 : x
  2. Step 2: Convert to fraction form
    1,109.64/1,531.26 = 644.04/x
  3. Step 3: Cross multiply
    1,109.64x = 1,531.26 × 644.04
  4. Step 4: Simplify right side
    1,109.64x = 986,192.69
  5. Step 5: Solve for x
    x = 986,192.69/1,109.64
  6. Step 6: Final answer
    x = 888.75

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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.