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Finding the Fourth Proportional to 470.21, 704.39 and 405.20

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Solution

The fourth proportional to 470.21, 704.39 and 405.20 is: 607.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    470.21 : 704.39 = 405.20 : x
  2. Step 2: Convert to fraction form
    470.21/704.39 = 405.20/x
  3. Step 3: Cross multiply
    470.21x = 704.39 × 405.20
  4. Step 4: Simplify right side
    470.21x = 285,418.56
  5. Step 5: Solve for x
    x = 285,418.56/470.21
  6. Step 6: Final answer
    x = 607.01

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.