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Finding the Fourth Proportional to 427.56, 640.08 and 325.26

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Solution

The fourth proportional to 427.56, 640.08 and 325.26 is: 486.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.56 : 640.08 = 325.26 : x
  2. Step 2: Convert to fraction form
    427.56/640.08 = 325.26/x
  3. Step 3: Cross multiply
    427.56x = 640.08 × 325.26
  4. Step 4: Simplify right side
    427.56x = 208,192.42
  5. Step 5: Solve for x
    x = 208,192.42/427.56
  6. Step 6: Final answer
    x = 486.93

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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.