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Finding the Fourth Proportional to 1,069.24, 1,603.92 and 299.76

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Solution

The fourth proportional to 1,069.24, 1,603.92 and 299.76 is: 449.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,069.24 : 1,603.92 = 299.76 : x
  2. Step 2: Convert to fraction form
    1,069.24/1,603.92 = 299.76/x
  3. Step 3: Cross multiply
    1,069.24x = 1,603.92 × 299.76
  4. Step 4: Simplify right side
    1,069.24x = 480,791.06
  5. Step 5: Solve for x
    x = 480,791.06/1,069.24
  6. Step 6: Final answer
    x = 449.66

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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.