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Finding the Fourth Proportional to 313.03, 431.21 and 239.32

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Solution

The fourth proportional to 313.03, 431.21 and 239.32 is: 329.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    313.03 : 431.21 = 239.32 : x
  2. Step 2: Convert to fraction form
    313.03/431.21 = 239.32/x
  3. Step 3: Cross multiply
    313.03x = 431.21 × 239.32
  4. Step 4: Simplify right side
    313.03x = 103,196.70
  5. Step 5: Solve for x
    x = 103,196.70/313.03
  6. Step 6: Final answer
    x = 329.67

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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.