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Finding the Fourth Proportional to 879.68, 1,211.80 and 682.84

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Solution

The fourth proportional to 879.68, 1,211.80 and 682.84 is: 940.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.68 : 1,211.80 = 682.84 : x
  2. Step 2: Convert to fraction form
    879.68/1,211.80 = 682.84/x
  3. Step 3: Cross multiply
    879.68x = 1,211.80 × 682.84
  4. Step 4: Simplify right side
    879.68x = 827,465.51
  5. Step 5: Solve for x
    x = 827,465.51/879.68
  6. Step 6: Final answer
    x = 940.64

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.