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Finding the Fourth Proportional to 1,361.44, 1,878.10 and 942.20

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Solution

The fourth proportional to 1,361.44, 1,878.10 and 942.20 is: 1,299.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,361.44 : 1,878.10 = 942.20 : x
  2. Step 2: Convert to fraction form
    1,361.44/1,878.10 = 942.20/x
  3. Step 3: Cross multiply
    1,361.44x = 1,878.10 × 942.20
  4. Step 4: Simplify right side
    1,361.44x = 1,769,545.82
  5. Step 5: Solve for x
    x = 1,769,545.82/1,361.44
  6. Step 6: Final answer
    x = 1,299.76

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1.5x scale

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.