Home / 1,361.39-2,042.45-387.57

Finding the Fourth Proportional to 1,361.39, 2,042.45 and 387.57

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Solution

The fourth proportional to 1,361.39, 2,042.45 and 387.57 is: 581.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,361.39 : 2,042.45 = 387.57 : x
  2. Step 2: Convert to fraction form
    1,361.39/2,042.45 = 387.57/x
  3. Step 3: Cross multiply
    1,361.39x = 2,042.45 × 387.57
  4. Step 4: Simplify right side
    1,361.39x = 791,590.41
  5. Step 5: Solve for x
    x = 791,590.41/1,361.39
  6. Step 6: Final answer
    x = 581.46

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.