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Finding the Fourth Proportional to 427.07, 640.56 and 311.74

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Solution

The fourth proportional to 427.07, 640.56 and 311.74 is: 467.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.07 : 640.56 = 311.74 : x
  2. Step 2: Convert to fraction form
    427.07/640.56 = 311.74/x
  3. Step 3: Cross multiply
    427.07x = 640.56 × 311.74
  4. Step 4: Simplify right side
    427.07x = 199,685.40
  5. Step 5: Solve for x
    x = 199,685.40/427.07
  6. Step 6: Final answer
    x = 467.58

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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.