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Finding the Fourth Proportional to 1,378.64, 2,067.93 and 404.75

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Solution

The fourth proportional to 1,378.64, 2,067.93 and 404.75 is: 607.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,378.64 : 2,067.93 = 404.75 : x
  2. Step 2: Convert to fraction form
    1,378.64/2,067.93 = 404.75/x
  3. Step 3: Cross multiply
    1,378.64x = 2,067.93 × 404.75
  4. Step 4: Simplify right side
    1,378.64x = 836,994.67
  5. Step 5: Solve for x
    x = 836,994.67/1,378.64
  6. Step 6: Final answer
    x = 607.12

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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.