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Finding the Fourth Proportional to 1,361.76, 1,878.84 and 1,161.60

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Solution

The fourth proportional to 1,361.76, 1,878.84 and 1,161.60 is: 1,602.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,361.76 : 1,878.84 = 1,161.60 : x
  2. Step 2: Convert to fraction form
    1,361.76/1,878.84 = 1,161.60/x
  3. Step 3: Cross multiply
    1,361.76x = 1,878.84 × 1,161.60
  4. Step 4: Simplify right side
    1,361.76x = 2,182,460.54
  5. Step 5: Solve for x
    x = 2,182,460.54/1,361.76
  6. Step 6: Final answer
    x = 1,602.68

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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.