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Finding the Fourth Proportional to 699.77, 1,049.66 and 212.79

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Solution

The fourth proportional to 699.77, 1,049.66 and 212.79 is: 319.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    699.77 : 1,049.66 = 212.79 : x
  2. Step 2: Convert to fraction form
    699.77/1,049.66 = 212.79/x
  3. Step 3: Cross multiply
    699.77x = 1,049.66 × 212.79
  4. Step 4: Simplify right side
    699.77x = 223,356.09
  5. Step 5: Solve for x
    x = 223,356.09/699.77
  6. Step 6: Final answer
    x = 319.19

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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.