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Finding the Fourth Proportional to 1,380.70, 2,071.16 and 393.51

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Solution

The fourth proportional to 1,380.70, 2,071.16 and 393.51 is: 590.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,380.70 : 2,071.16 = 393.51 : x
  2. Step 2: Convert to fraction form
    1,380.70/2,071.16 = 393.51/x
  3. Step 3: Cross multiply
    1,380.70x = 2,071.16 × 393.51
  4. Step 4: Simplify right side
    1,380.70x = 815,028.33
  5. Step 5: Solve for x
    x = 815,028.33/1,380.70
  6. Step 6: Final answer
    x = 590.30

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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.