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Finding the Fourth Proportional to 693.25, 1,040.05 and 206.30

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Solution

The fourth proportional to 693.25, 1,040.05 and 206.30 is: 309.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    693.25 : 1,040.05 = 206.30 : x
  2. Step 2: Convert to fraction form
    693.25/1,040.05 = 206.30/x
  3. Step 3: Cross multiply
    693.25x = 1,040.05 × 206.30
  4. Step 4: Simplify right side
    693.25x = 214,560.50
  5. Step 5: Solve for x
    x = 214,560.50/693.25
  6. Step 6: Final answer
    x = 309.50

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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.