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Finding the Fourth Proportional to 1,069.27, 1,603.13 and 721.75

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Solution

The fourth proportional to 1,069.27, 1,603.13 and 721.75 is: 1,082.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,069.27 : 1,603.13 = 721.75 : x
  2. Step 2: Convert to fraction form
    1,069.27/1,603.13 = 721.75/x
  3. Step 3: Cross multiply
    1,069.27x = 1,603.13 × 721.75
  4. Step 4: Simplify right side
    1,069.27x = 1,157,051.99
  5. Step 5: Solve for x
    x = 1,157,051.99/1,069.27
  6. Step 6: Final answer
    x = 1,082.09

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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.