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Finding the Fourth Proportional to 1,069.28, 1,603.55 and 411.21

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Solution

The fourth proportional to 1,069.28, 1,603.55 and 411.21 is: 616.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,069.28 : 1,603.55 = 411.21 : x
  2. Step 2: Convert to fraction form
    1,069.28/1,603.55 = 411.21/x
  3. Step 3: Cross multiply
    1,069.28x = 1,603.55 × 411.21
  4. Step 4: Simplify right side
    1,069.28x = 659,393.74
  5. Step 5: Solve for x
    x = 659,393.74/1,069.28
  6. Step 6: Final answer
    x = 616.67

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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.