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Finding the Fourth Proportional to 1,261.79, 1,891.04 and 644.98

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Solution

The fourth proportional to 1,261.79, 1,891.04 and 644.98 is: 966.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,261.79 : 1,891.04 = 644.98 : x
  2. Step 2: Convert to fraction form
    1,261.79/1,891.04 = 644.98/x
  3. Step 3: Cross multiply
    1,261.79x = 1,891.04 × 644.98
  4. Step 4: Simplify right side
    1,261.79x = 1,219,682.98
  5. Step 5: Solve for x
    x = 1,219,682.98/1,261.79
  6. Step 6: Final answer
    x = 966.63

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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.