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Finding the Fourth Proportional to 447.65, 670.38 and 427.89

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Solution

The fourth proportional to 447.65, 670.38 and 427.89 is: 640.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    447.65 : 670.38 = 427.89 : x
  2. Step 2: Convert to fraction form
    447.65/670.38 = 427.89/x
  3. Step 3: Cross multiply
    447.65x = 670.38 × 427.89
  4. Step 4: Simplify right side
    447.65x = 286,848.90
  5. Step 5: Solve for x
    x = 286,848.90/447.65
  6. Step 6: Final answer
    x = 640.80

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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.