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Finding the Fourth Proportional to 421.43, 630.52 and 229.19

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Solution

The fourth proportional to 421.43, 630.52 and 229.19 is: 342.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.43 : 630.52 = 229.19 : x
  2. Step 2: Convert to fraction form
    421.43/630.52 = 229.19/x
  3. Step 3: Cross multiply
    421.43x = 630.52 × 229.19
  4. Step 4: Simplify right side
    421.43x = 144,505.15
  5. Step 5: Solve for x
    x = 144,505.15/421.43
  6. Step 6: Final answer
    x = 342.90

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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.