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Finding the Fourth Proportional to 427.16, 640.73 and 400.43

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Solution

The fourth proportional to 427.16, 640.73 and 400.43 is: 600.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.16 : 640.73 = 400.43 : x
  2. Step 2: Convert to fraction form
    427.16/640.73 = 400.43/x
  3. Step 3: Cross multiply
    427.16x = 640.73 × 400.43
  4. Step 4: Simplify right side
    427.16x = 256,567.51
  5. Step 5: Solve for x
    x = 256,567.51/427.16
  6. Step 6: Final answer
    x = 600.64

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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.