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Finding the Fourth Proportional to 956.21, 1,319.02 and 660.96

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Solution

The fourth proportional to 956.21, 1,319.02 and 660.96 is: 911.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    956.21 : 1,319.02 = 660.96 : x
  2. Step 2: Convert to fraction form
    956.21/1,319.02 = 660.96/x
  3. Step 3: Cross multiply
    956.21x = 1,319.02 × 660.96
  4. Step 4: Simplify right side
    956.21x = 871,817.81
  5. Step 5: Solve for x
    x = 871,817.81/956.21
  6. Step 6: Final answer
    x = 911.75

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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.