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Finding the Fourth Proportional to 1,361.26, 1,878.53 and 740.26

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Solution

The fourth proportional to 1,361.26, 1,878.53 and 740.26 is: 1,021.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,361.26 : 1,878.53 = 740.26 : x
  2. Step 2: Convert to fraction form
    1,361.26/1,878.53 = 740.26/x
  3. Step 3: Cross multiply
    1,361.26x = 1,878.53 × 740.26
  4. Step 4: Simplify right side
    1,361.26x = 1,390,600.62
  5. Step 5: Solve for x
    x = 1,390,600.62/1,361.26
  6. Step 6: Final answer
    x = 1,021.55

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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.