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Finding the Fourth Proportional to 451.84, 623.78 and 305.25

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Solution

The fourth proportional to 451.84, 623.78 and 305.25 is: 421.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    451.84 : 623.78 = 305.25 : x
  2. Step 2: Convert to fraction form
    451.84/623.78 = 305.25/x
  3. Step 3: Cross multiply
    451.84x = 623.78 × 305.25
  4. Step 4: Simplify right side
    451.84x = 190,408.85
  5. Step 5: Solve for x
    x = 190,408.85/451.84
  6. Step 6: Final answer
    x = 421.41

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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.