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Finding the Fourth Proportional to 347.66, 479.60 and 221.68

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Solution

The fourth proportional to 347.66, 479.60 and 221.68 is: 305.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    347.66 : 479.60 = 221.68 : x
  2. Step 2: Convert to fraction form
    347.66/479.60 = 221.68/x
  3. Step 3: Cross multiply
    347.66x = 479.60 × 221.68
  4. Step 4: Simplify right side
    347.66x = 106,318.05
  5. Step 5: Solve for x
    x = 106,318.05/347.66
  6. Step 6: Final answer
    x = 305.81

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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.