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Finding the Fourth Proportional to 677.21, 1,015.81 and 190.28

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Solution

The fourth proportional to 677.21, 1,015.81 and 190.28 is: 285.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    677.21 : 1,015.81 = 190.28 : x
  2. Step 2: Convert to fraction form
    677.21/1,015.81 = 190.28/x
  3. Step 3: Cross multiply
    677.21x = 1,015.81 × 190.28
  4. Step 4: Simplify right side
    677.21x = 193,282.77
  5. Step 5: Solve for x
    x = 193,282.77/677.21
  6. Step 6: Final answer
    x = 285.41

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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.