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Finding the Fourth Proportional to 1,268.24, 1,902.64 and 390.82

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Solution

The fourth proportional to 1,268.24, 1,902.64 and 390.82 is: 586.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,268.24 : 1,902.64 = 390.82 : x
  2. Step 2: Convert to fraction form
    1,268.24/1,902.64 = 390.82/x
  3. Step 3: Cross multiply
    1,268.24x = 1,902.64 × 390.82
  4. Step 4: Simplify right side
    1,268.24x = 743,589.76
  5. Step 5: Solve for x
    x = 743,589.76/1,268.24
  6. Step 6: Final answer
    x = 586.32

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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.