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Finding the Fourth Proportional to 1,310.36, 1,808.30 and 786.39

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Solution

The fourth proportional to 1,310.36, 1,808.30 and 786.39 is: 1,085.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,310.36 : 1,808.30 = 786.39 : x
  2. Step 2: Convert to fraction form
    1,310.36/1,808.30 = 786.39/x
  3. Step 3: Cross multiply
    1,310.36x = 1,808.30 × 786.39
  4. Step 4: Simplify right side
    1,310.36x = 1,422,027.07
  5. Step 5: Solve for x
    x = 1,422,027.07/1,310.36
  6. Step 6: Final answer
    x = 1,085.22

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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.