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Finding the Fourth Proportional to 1,008.50, 1,392.36 and 694.28

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Solution

The fourth proportional to 1,008.50, 1,392.36 and 694.28 is: 958.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.50 : 1,392.36 = 694.28 : x
  2. Step 2: Convert to fraction form
    1,008.50/1,392.36 = 694.28/x
  3. Step 3: Cross multiply
    1,008.50x = 1,392.36 × 694.28
  4. Step 4: Simplify right side
    1,008.50x = 966,687.70
  5. Step 5: Solve for x
    x = 966,687.70/1,008.50
  6. Step 6: Final answer
    x = 958.54

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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.