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Finding the Fourth Proportional to 1,069.50, 1,604.25 and 385.50

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Solution

The fourth proportional to 1,069.50, 1,604.25 and 385.50 is: 578.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,069.50 : 1,604.25 = 385.50 : x
  2. Step 2: Convert to fraction form
    1,069.50/1,604.25 = 385.50/x
  3. Step 3: Cross multiply
    1,069.50x = 1,604.25 × 385.50
  4. Step 4: Simplify right side
    1,069.50x = 618,438.38
  5. Step 5: Solve for x
    x = 618,438.38/1,069.50
  6. Step 6: Final answer
    x = 578.25

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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.