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Finding the Fourth Proportional to 693.31, 1,040.14 and 206.36

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Solution

The fourth proportional to 693.31, 1,040.14 and 206.36 is: 309.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    693.31 : 1,040.14 = 206.36 : x
  2. Step 2: Convert to fraction form
    693.31/1,040.14 = 206.36/x
  3. Step 3: Cross multiply
    693.31x = 1,040.14 × 206.36
  4. Step 4: Simplify right side
    693.31x = 214,645.89
  5. Step 5: Solve for x
    x = 214,645.89/693.31
  6. Step 6: Final answer
    x = 309.59

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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.