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Finding the Fourth Proportional to 1,239.86, 1,709.87 and 959.20

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Solution

The fourth proportional to 1,239.86, 1,709.87 and 959.20 is: 1,322.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.86 : 1,709.87 = 959.20 : x
  2. Step 2: Convert to fraction form
    1,239.86/1,709.87 = 959.20/x
  3. Step 3: Cross multiply
    1,239.86x = 1,709.87 × 959.20
  4. Step 4: Simplify right side
    1,239.86x = 1,640,107.30
  5. Step 5: Solve for x
    x = 1,640,107.30/1,239.86
  6. Step 6: Final answer
    x = 1,322.82

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.