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Finding the Fourth Proportional to 470.75, 649.75 and 274.30

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Solution

The fourth proportional to 470.75, 649.75 and 274.30 is: 378.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    470.75 : 649.75 = 274.30 : x
  2. Step 2: Convert to fraction form
    470.75/649.75 = 274.30/x
  3. Step 3: Cross multiply
    470.75x = 649.75 × 274.30
  4. Step 4: Simplify right side
    470.75x = 178,226.43
  5. Step 5: Solve for x
    x = 178,226.43/470.75
  6. Step 6: Final answer
    x = 378.60

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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.