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Finding the Fourth Proportional to 1,361.67, 1,876.92 and 918.80

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Solution

The fourth proportional to 1,361.67, 1,876.92 and 918.80 is: 1,266.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,361.67 : 1,876.92 = 918.80 : x
  2. Step 2: Convert to fraction form
    1,361.67/1,876.92 = 918.80/x
  3. Step 3: Cross multiply
    1,361.67x = 1,876.92 × 918.80
  4. Step 4: Simplify right side
    1,361.67x = 1,724,518.79
  5. Step 5: Solve for x
    x = 1,724,518.79/1,361.67
  6. Step 6: Final answer
    x = 1,266.47

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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.