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Finding the Fourth Proportional to 1,192.70, 1,789.46 and 782.03

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Solution

The fourth proportional to 1,192.70, 1,789.46 and 782.03 is: 1,173.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,192.70 : 1,789.46 = 782.03 : x
  2. Step 2: Convert to fraction form
    1,192.70/1,789.46 = 782.03/x
  3. Step 3: Cross multiply
    1,192.70x = 1,789.46 × 782.03
  4. Step 4: Simplify right side
    1,192.70x = 1,399,411.40
  5. Step 5: Solve for x
    x = 1,399,411.40/1,192.70
  6. Step 6: Final answer
    x = 1,173.31

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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.