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Finding the Fourth Proportional to 960.31, 1,325.37 and 711.28

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Solution

The fourth proportional to 960.31, 1,325.37 and 711.28 is: 981.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    960.31 : 1,325.37 = 711.28 : x
  2. Step 2: Convert to fraction form
    960.31/1,325.37 = 711.28/x
  3. Step 3: Cross multiply
    960.31x = 1,325.37 × 711.28
  4. Step 4: Simplify right side
    960.31x = 942,709.17
  5. Step 5: Solve for x
    x = 942,709.17/960.31
  6. Step 6: Final answer
    x = 981.67

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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.