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Finding the Fourth Proportional to 606.40, 909.36 and 221.56

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Solution

The fourth proportional to 606.40, 909.36 and 221.56 is: 332.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    606.40 : 909.36 = 221.56 : x
  2. Step 2: Convert to fraction form
    606.40/909.36 = 221.56/x
  3. Step 3: Cross multiply
    606.40x = 909.36 × 221.56
  4. Step 4: Simplify right side
    606.40x = 201,477.80
  5. Step 5: Solve for x
    x = 201,477.80/606.40
  6. Step 6: Final answer
    x = 332.25

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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.