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Finding the Fourth Proportional to 989.56, 1,365.06 and 694.68

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Solution

The fourth proportional to 989.56, 1,365.06 and 694.68 is: 958.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.56 : 1,365.06 = 694.68 : x
  2. Step 2: Convert to fraction form
    989.56/1,365.06 = 694.68/x
  3. Step 3: Cross multiply
    989.56x = 1,365.06 × 694.68
  4. Step 4: Simplify right side
    989.56x = 948,279.88
  5. Step 5: Solve for x
    x = 948,279.88/989.56
  6. Step 6: Final answer
    x = 958.28

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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.