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Finding the Fourth Proportional to 693.12, 1,039.79 and 206.12

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Solution

The fourth proportional to 693.12, 1,039.79 and 206.12 is: 309.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    693.12 : 1,039.79 = 206.12 : x
  2. Step 2: Convert to fraction form
    693.12/1,039.79 = 206.12/x
  3. Step 3: Cross multiply
    693.12x = 1,039.79 × 206.12
  4. Step 4: Simplify right side
    693.12x = 214,315.29
  5. Step 5: Solve for x
    x = 214,315.29/693.12
  6. Step 6: Final answer
    x = 309.20

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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.