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Finding the Fourth Proportional to 451.90, 678.12 and 415.72

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Solution

The fourth proportional to 451.90, 678.12 and 415.72 is: 623.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    451.90 : 678.12 = 415.72 : x
  2. Step 2: Convert to fraction form
    451.90/678.12 = 415.72/x
  3. Step 3: Cross multiply
    451.90x = 678.12 × 415.72
  4. Step 4: Simplify right side
    451.90x = 281,908.05
  5. Step 5: Solve for x
    x = 281,908.05/451.90
  6. Step 6: Final answer
    x = 623.83

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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.