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Finding the Fourth Proportional to 483.30, 668.25 and 421.81

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Solution

The fourth proportional to 483.30, 668.25 and 421.81 is: 583.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    483.30 : 668.25 = 421.81 : x
  2. Step 2: Convert to fraction form
    483.30/668.25 = 421.81/x
  3. Step 3: Cross multiply
    483.30x = 668.25 × 421.81
  4. Step 4: Simplify right side
    483.30x = 281,872.86
  5. Step 5: Solve for x
    x = 281,872.86/483.30
  6. Step 6: Final answer
    x = 583.23

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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.