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Finding the Fourth Proportional to 979.21, 1,353.07 and 698.96

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Solution

The fourth proportional to 979.21, 1,353.07 and 698.96 is: 965.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.21 : 1,353.07 = 698.96 : x
  2. Step 2: Convert to fraction form
    979.21/1,353.07 = 698.96/x
  3. Step 3: Cross multiply
    979.21x = 1,353.07 × 698.96
  4. Step 4: Simplify right side
    979.21x = 945,741.81
  5. Step 5: Solve for x
    x = 945,741.81/979.21
  6. Step 6: Final answer
    x = 965.82

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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.