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Finding the Fourth Proportional to 1,192.26, 1,789.20 and 644.50

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Solution

The fourth proportional to 1,192.26, 1,789.20 and 644.50 is: 967.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,192.26 : 1,789.20 = 644.50 : x
  2. Step 2: Convert to fraction form
    1,192.26/1,789.20 = 644.50/x
  3. Step 3: Cross multiply
    1,192.26x = 1,789.20 × 644.50
  4. Step 4: Simplify right side
    1,192.26x = 1,153,134.93
  5. Step 5: Solve for x
    x = 1,153,134.93/1,192.26
  6. Step 6: Final answer
    x = 967.18

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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.