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Finding the Fourth Proportional to 427.48, 640.95 and 281.06

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Solution

The fourth proportional to 427.48, 640.95 and 281.06 is: 421.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.48 : 640.95 = 281.06 : x
  2. Step 2: Convert to fraction form
    427.48/640.95 = 281.06/x
  3. Step 3: Cross multiply
    427.48x = 640.95 × 281.06
  4. Step 4: Simplify right side
    427.48x = 180,144.00
  5. Step 5: Solve for x
    x = 180,144.00/427.48
  6. Step 6: Final answer
    x = 421.41

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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.