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Finding the Fourth Proportional to 884.05, 1,218.41 and 718.81

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Solution

The fourth proportional to 884.05, 1,218.41 and 718.81 is: 990.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    884.05 : 1,218.41 = 718.81 : x
  2. Step 2: Convert to fraction form
    884.05/1,218.41 = 718.81/x
  3. Step 3: Cross multiply
    884.05x = 1,218.41 × 718.81
  4. Step 4: Simplify right side
    884.05x = 875,801.70
  5. Step 5: Solve for x
    x = 875,801.70/884.05
  6. Step 6: Final answer
    x = 990.67

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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.