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Finding the Fourth Proportional to 430.28, 645.21 and 224.81

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Solution

The fourth proportional to 430.28, 645.21 and 224.81 is: 337.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    430.28 : 645.21 = 224.81 : x
  2. Step 2: Convert to fraction form
    430.28/645.21 = 224.81/x
  3. Step 3: Cross multiply
    430.28x = 645.21 × 224.81
  4. Step 4: Simplify right side
    430.28x = 145,046.43
  5. Step 5: Solve for x
    x = 145,046.43/430.28
  6. Step 6: Final answer
    x = 337.10

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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.