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Finding the Fourth Proportional to 1,261.35, 1,891.74 and 644.28

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Solution

The fourth proportional to 1,261.35, 1,891.74 and 644.28 is: 966.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,261.35 : 1,891.74 = 644.28 : x
  2. Step 2: Convert to fraction form
    1,261.35/1,891.74 = 644.28/x
  3. Step 3: Cross multiply
    1,261.35x = 1,891.74 × 644.28
  4. Step 4: Simplify right side
    1,261.35x = 1,218,810.25
  5. Step 5: Solve for x
    x = 1,218,810.25/1,261.35
  6. Step 6: Final answer
    x = 966.27

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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.