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Finding the Fourth Proportional to 1,069.05, 1,603.62 and 338.55

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Solution

The fourth proportional to 1,069.05, 1,603.62 and 338.55 is: 507.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,069.05 : 1,603.62 = 338.55 : x
  2. Step 2: Convert to fraction form
    1,069.05/1,603.62 = 338.55/x
  3. Step 3: Cross multiply
    1,069.05x = 1,603.62 × 338.55
  4. Step 4: Simplify right side
    1,069.05x = 542,914.02
  5. Step 5: Solve for x
    x = 542,914.02/1,069.05
  6. Step 6: Final answer
    x = 507.85

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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.