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Finding the Fourth Proportional to 1,361.22, 1,878.49 and 740.22

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Solution

The fourth proportional to 1,361.22, 1,878.49 and 740.22 is: 1,021.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,361.22 : 1,878.49 = 740.22 : x
  2. Step 2: Convert to fraction form
    1,361.22/1,878.49 = 740.22/x
  3. Step 3: Cross multiply
    1,361.22x = 1,878.49 × 740.22
  4. Step 4: Simplify right side
    1,361.22x = 1,390,495.87
  5. Step 5: Solve for x
    x = 1,390,495.87/1,361.22
  6. Step 6: Final answer
    x = 1,021.51

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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.