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Finding the Fourth Proportional to 320.30, 443.81 and 313.39

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Solution

The fourth proportional to 320.30, 443.81 and 313.39 is: 434.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.30 : 443.81 = 313.39 : x
  2. Step 2: Convert to fraction form
    320.30/443.81 = 313.39/x
  3. Step 3: Cross multiply
    320.30x = 443.81 × 313.39
  4. Step 4: Simplify right side
    320.30x = 139,082.94
  5. Step 5: Solve for x
    x = 139,082.94/320.30
  6. Step 6: Final answer
    x = 434.22

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.