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Finding the Fourth Proportional to 1,261.50, 1,891.17 and 644.82

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Solution

The fourth proportional to 1,261.50, 1,891.17 and 644.82 is: 966.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,261.50 : 1,891.17 = 644.82 : x
  2. Step 2: Convert to fraction form
    1,261.50/1,891.17 = 644.82/x
  3. Step 3: Cross multiply
    1,261.50x = 1,891.17 × 644.82
  4. Step 4: Simplify right side
    1,261.50x = 1,219,464.24
  5. Step 5: Solve for x
    x = 1,219,464.24/1,261.50
  6. Step 6: Final answer
    x = 966.68

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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.