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Finding the Fourth Proportional to 1,069.35, 1,603.88 and 338.91

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Solution

The fourth proportional to 1,069.35, 1,603.88 and 338.91 is: 508.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,069.35 : 1,603.88 = 338.91 : x
  2. Step 2: Convert to fraction form
    1,069.35/1,603.88 = 338.91/x
  3. Step 3: Cross multiply
    1,069.35x = 1,603.88 × 338.91
  4. Step 4: Simplify right side
    1,069.35x = 543,568.09
  5. Step 5: Solve for x
    x = 543,568.09/1,069.35
  6. Step 6: Final answer
    x = 508.32

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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.