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Finding the Fourth Proportional to 699.12, 1,048.78 and 212.12

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Solution

The fourth proportional to 699.12, 1,048.78 and 212.12 is: 318.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    699.12 : 1,048.78 = 212.12 : x
  2. Step 2: Convert to fraction form
    699.12/1,048.78 = 212.12/x
  3. Step 3: Cross multiply
    699.12x = 1,048.78 × 212.12
  4. Step 4: Simplify right side
    699.12x = 222,467.21
  5. Step 5: Solve for x
    x = 222,467.21/699.12
  6. Step 6: Final answer
    x = 318.21

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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.