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Finding the Fourth Proportional to 404.21, 606.30 and 115.64

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Solution

The fourth proportional to 404.21, 606.30 and 115.64 is: 173.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    404.21 : 606.30 = 115.64 : x
  2. Step 2: Convert to fraction form
    404.21/606.30 = 115.64/x
  3. Step 3: Cross multiply
    404.21x = 606.30 × 115.64
  4. Step 4: Simplify right side
    404.21x = 70,109.50
  5. Step 5: Solve for x
    x = 70,109.50/404.21
  6. Step 6: Final answer
    x = 173.45

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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.