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Finding the Fourth Proportional to 1,268.06, 1,901.79 and 390.44

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Solution

The fourth proportional to 1,268.06, 1,901.79 and 390.44 is: 585.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,268.06 : 1,901.79 = 390.44 : x
  2. Step 2: Convert to fraction form
    1,268.06/1,901.79 = 390.44/x
  3. Step 3: Cross multiply
    1,268.06x = 1,901.79 × 390.44
  4. Step 4: Simplify right side
    1,268.06x = 742,534.89
  5. Step 5: Solve for x
    x = 742,534.89/1,268.06
  6. Step 6: Final answer
    x = 585.57

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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.