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Finding the Fourth Proportional to 451.79, 673.87 and 438.12

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Solution

The fourth proportional to 451.79, 673.87 and 438.12 is: 653.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    451.79 : 673.87 = 438.12 : x
  2. Step 2: Convert to fraction form
    451.79/673.87 = 438.12/x
  3. Step 3: Cross multiply
    451.79x = 673.87 × 438.12
  4. Step 4: Simplify right side
    451.79x = 295,236.47
  5. Step 5: Solve for x
    x = 295,236.47/451.79
  6. Step 6: Final answer
    x = 653.48

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.