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Finding the Fourth Proportional to 1,272.03, 1,908.05 and 694.59

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Solution

The fourth proportional to 1,272.03, 1,908.05 and 694.59 is: 1,041.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272.03 : 1,908.05 = 694.59 : x
  2. Step 2: Convert to fraction form
    1,272.03/1,908.05 = 694.59/x
  3. Step 3: Cross multiply
    1,272.03x = 1,908.05 × 694.59
  4. Step 4: Simplify right side
    1,272.03x = 1,325,308.98
  5. Step 5: Solve for x
    x = 1,325,308.98/1,272.03
  6. Step 6: Final answer
    x = 1,041.89

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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.