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Finding the Fourth Proportional to 1,395.11, 2,090.97 and 778.16

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Solution

The fourth proportional to 1,395.11, 2,090.97 and 778.16 is: 1,166.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,395.11 : 2,090.97 = 778.16 : x
  2. Step 2: Convert to fraction form
    1,395.11/2,090.97 = 778.16/x
  3. Step 3: Cross multiply
    1,395.11x = 2,090.97 × 778.16
  4. Step 4: Simplify right side
    1,395.11x = 1,627,109.22
  5. Step 5: Solve for x
    x = 1,627,109.22/1,395.11
  6. Step 6: Final answer
    x = 1,166.29

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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.