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Finding the Fourth Proportional to 1,808.10, 2,708.10 and 1,395.90

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Solution

The fourth proportional to 1,808.10, 2,708.10 and 1,395.90 is: 2,090.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,808.10 : 2,708.10 = 1,395.90 : x
  2. Step 2: Convert to fraction form
    1,808.10/2,708.10 = 1,395.90/x
  3. Step 3: Cross multiply
    1,808.10x = 2,708.10 × 1,395.90
  4. Step 4: Simplify right side
    1,808.10x = 3,780,236.79
  5. Step 5: Solve for x
    x = 3,780,236.79/1,808.10
  6. Step 6: Final answer
    x = 2,090.72

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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.