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Finding the Fourth Proportional to 1,305.14, 1,800.09 and 781.07

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Solution

The fourth proportional to 1,305.14, 1,800.09 and 781.07 is: 1,077.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,305.14 : 1,800.09 = 781.07 : x
  2. Step 2: Convert to fraction form
    1,305.14/1,800.09 = 781.07/x
  3. Step 3: Cross multiply
    1,305.14x = 1,800.09 × 781.07
  4. Step 4: Simplify right side
    1,305.14x = 1,405,987.30
  5. Step 5: Solve for x
    x = 1,405,987.30/1,305.14
  6. Step 6: Final answer
    x = 1,077.27

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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.