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Finding the Fourth Proportional to 1,229.85, 1,695.20 and 1,069.93

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Solution

The fourth proportional to 1,229.85, 1,695.20 and 1,069.93 is: 1,474.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,229.85 : 1,695.20 = 1,069.93 : x
  2. Step 2: Convert to fraction form
    1,229.85/1,695.20 = 1,069.93/x
  3. Step 3: Cross multiply
    1,229.85x = 1,695.20 × 1,069.93
  4. Step 4: Simplify right side
    1,229.85x = 1,813,735.75
  5. Step 5: Solve for x
    x = 1,813,735.75/1,229.85
  6. Step 6: Final answer
    x = 1,474.76

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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.