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Finding the Fourth Proportional to 1,261.79, 1,891.82 and 644.99

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Solution

The fourth proportional to 1,261.79, 1,891.82 and 644.99 is: 967.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,261.79 : 1,891.82 = 644.99 : x
  2. Step 2: Convert to fraction form
    1,261.79/1,891.82 = 644.99/x
  3. Step 3: Cross multiply
    1,261.79x = 1,891.82 × 644.99
  4. Step 4: Simplify right side
    1,261.79x = 1,220,202.46
  5. Step 5: Solve for x
    x = 1,220,202.46/1,261.79
  6. Step 6: Final answer
    x = 967.04

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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.