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Finding the Fourth Proportional to 1,069.05, 1,603.31 and 419.79

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Solution

The fourth proportional to 1,069.05, 1,603.31 and 419.79 is: 629.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,069.05 : 1,603.31 = 419.79 : x
  2. Step 2: Convert to fraction form
    1,069.05/1,603.31 = 419.79/x
  3. Step 3: Cross multiply
    1,069.05x = 1,603.31 × 419.79
  4. Step 4: Simplify right side
    1,069.05x = 673,051.41
  5. Step 5: Solve for x
    x = 673,051.41/1,069.05
  6. Step 6: Final answer
    x = 629.58

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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.