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Finding the Fourth Proportional to 1,218.98, 1,682.09 and 694.90

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Solution

The fourth proportional to 1,218.98, 1,682.09 and 694.90 is: 958.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,218.98 : 1,682.09 = 694.90 : x
  2. Step 2: Convert to fraction form
    1,218.98/1,682.09 = 694.90/x
  3. Step 3: Cross multiply
    1,218.98x = 1,682.09 × 694.90
  4. Step 4: Simplify right side
    1,218.98x = 1,168,884.34
  5. Step 5: Solve for x
    x = 1,168,884.34/1,218.98
  6. Step 6: Final answer
    x = 958.90

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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.