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Finding the Fourth Proportional to 1,218.81, 1,682.19 and 694.89

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Solution

The fourth proportional to 1,218.81, 1,682.19 and 694.89 is: 959.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,218.81 : 1,682.19 = 694.89 : x
  2. Step 2: Convert to fraction form
    1,218.81/1,682.19 = 694.89/x
  3. Step 3: Cross multiply
    1,218.81x = 1,682.19 × 694.89
  4. Step 4: Simplify right side
    1,218.81x = 1,168,937.01
  5. Step 5: Solve for x
    x = 1,168,937.01/1,218.81
  6. Step 6: Final answer
    x = 959.08

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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.