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Finding the Fourth Proportional to 320.08, 477.38 and 274

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Solution

The fourth proportional to 320.08, 477.38 and 274 is: 408.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.08 : 477.38 = 274 : x
  2. Step 2: Convert to fraction form
    320.08/477.38 = 274/x
  3. Step 3: Cross multiply
    320.08x = 477.38 × 274
  4. Step 4: Simplify right side
    320.08x = 130,802.12
  5. Step 5: Solve for x
    x = 130,802.12/320.08
  6. Step 6: Final answer
    x = 408.65

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.