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Finding the Fourth Proportional to 1,361.22, 2,038.98 and 871.80

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Solution

The fourth proportional to 1,361.22, 2,038.98 and 871.80 is: 1,305.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,361.22 : 2,038.98 = 871.80 : x
  2. Step 2: Convert to fraction form
    1,361.22/2,038.98 = 871.80/x
  3. Step 3: Cross multiply
    1,361.22x = 2,038.98 × 871.80
  4. Step 4: Simplify right side
    1,361.22x = 1,777,582.76
  5. Step 5: Solve for x
    x = 1,777,582.76/1,361.22
  6. Step 6: Final answer
    x = 1,305.87

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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.