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Finding the Fourth Proportional to 1,361.64, 1,878.50 and 808.68

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Solution

The fourth proportional to 1,361.64, 1,878.50 and 808.68 is: 1,115.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,361.64 : 1,878.50 = 808.68 : x
  2. Step 2: Convert to fraction form
    1,361.64/1,878.50 = 808.68/x
  3. Step 3: Cross multiply
    1,361.64x = 1,878.50 × 808.68
  4. Step 4: Simplify right side
    1,361.64x = 1,519,105.38
  5. Step 5: Solve for x
    x = 1,519,105.38/1,361.64
  6. Step 6: Final answer
    x = 1,115.64

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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.