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Finding the Fourth Proportional to 1,270.05, 1,903.25 and 721.07

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Solution

The fourth proportional to 1,270.05, 1,903.25 and 721.07 is: 1,080.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,270.05 : 1,903.25 = 721.07 : x
  2. Step 2: Convert to fraction form
    1,270.05/1,903.25 = 721.07/x
  3. Step 3: Cross multiply
    1,270.05x = 1,903.25 × 721.07
  4. Step 4: Simplify right side
    1,270.05x = 1,372,371.85
  5. Step 5: Solve for x
    x = 1,372,371.85/1,270.05
  6. Step 6: Final answer
    x = 1,080.57

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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.