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Finding the Fourth Proportional to 1,292.12, 1,782.90 and 851.07

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Solution

The fourth proportional to 1,292.12, 1,782.90 and 851.07 is: 1,174.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,292.12 : 1,782.90 = 851.07 : x
  2. Step 2: Convert to fraction form
    1,292.12/1,782.90 = 851.07/x
  3. Step 3: Cross multiply
    1,292.12x = 1,782.90 × 851.07
  4. Step 4: Simplify right side
    1,292.12x = 1,517,372.70
  5. Step 5: Solve for x
    x = 1,517,372.70/1,292.12
  6. Step 6: Final answer
    x = 1,174.33

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.