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Finding the Fourth Proportional to 1,398.80, 2,098.61 and 668.99

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Solution

The fourth proportional to 1,398.80, 2,098.61 and 668.99 is: 1,003.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,398.80 : 2,098.61 = 668.99 : x
  2. Step 2: Convert to fraction form
    1,398.80/2,098.61 = 668.99/x
  3. Step 3: Cross multiply
    1,398.80x = 2,098.61 × 668.99
  4. Step 4: Simplify right side
    1,398.80x = 1,403,935.27
  5. Step 5: Solve for x
    x = 1,403,935.27/1,398.80
  6. Step 6: Final answer
    x = 1,003.67

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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.