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Finding the Fourth Proportional to 1,069.50, 1,603.42 and 607.80

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Solution

The fourth proportional to 1,069.50, 1,603.42 and 607.80 is: 911.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,069.50 : 1,603.42 = 607.80 : x
  2. Step 2: Convert to fraction form
    1,069.50/1,603.42 = 607.80/x
  3. Step 3: Cross multiply
    1,069.50x = 1,603.42 × 607.80
  4. Step 4: Simplify right side
    1,069.50x = 974,558.68
  5. Step 5: Solve for x
    x = 974,558.68/1,069.50
  6. Step 6: Final answer
    x = 911.23

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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.