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Finding the Fourth Proportional to 2,690.51, 4,036.31 and 959.09

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Solution

The fourth proportional to 2,690.51, 4,036.31 and 959.09 is: 1,438.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,690.51 : 4,036.31 = 959.09 : x
  2. Step 2: Convert to fraction form
    2,690.51/4,036.31 = 959.09/x
  3. Step 3: Cross multiply
    2,690.51x = 4,036.31 × 959.09
  4. Step 4: Simplify right side
    2,690.51x = 3,871,179.76
  5. Step 5: Solve for x
    x = 3,871,179.76/2,690.51
  6. Step 6: Final answer
    x = 1,438.83

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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.