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Finding the Fourth Proportional to 699.81, 1,049.42 and 212.75

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Solution

The fourth proportional to 699.81, 1,049.42 and 212.75 is: 319.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    699.81 : 1,049.42 = 212.75 : x
  2. Step 2: Convert to fraction form
    699.81/1,049.42 = 212.75/x
  3. Step 3: Cross multiply
    699.81x = 1,049.42 × 212.75
  4. Step 4: Simplify right side
    699.81x = 223,264.11
  5. Step 5: Solve for x
    x = 223,264.11/699.81
  6. Step 6: Final answer
    x = 319.04

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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.