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Finding the Fourth Proportional to 470.40, 649.20 and 273.90

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Solution

The fourth proportional to 470.40, 649.20 and 273.90 is: 378.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    470.40 : 649.20 = 273.90 : x
  2. Step 2: Convert to fraction form
    470.40/649.20 = 273.90/x
  3. Step 3: Cross multiply
    470.40x = 649.20 × 273.90
  4. Step 4: Simplify right side
    470.40x = 177,815.88
  5. Step 5: Solve for x
    x = 177,815.88/470.40
  6. Step 6: Final answer
    x = 378.01

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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.