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Finding the Fourth Proportional to 891.40, 1,230.42 and 694.60

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Solution

The fourth proportional to 891.40, 1,230.42 and 694.60 is: 958.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.40 : 1,230.42 = 694.60 : x
  2. Step 2: Convert to fraction form
    891.40/1,230.42 = 694.60/x
  3. Step 3: Cross multiply
    891.40x = 1,230.42 × 694.60
  4. Step 4: Simplify right side
    891.40x = 854,649.73
  5. Step 5: Solve for x
    x = 854,649.73/891.40
  6. Step 6: Final answer
    x = 958.77

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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.