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Finding the Fourth Proportional to 467.36, 643.20 and 394.64

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Solution

The fourth proportional to 467.36, 643.20 and 394.64 is: 543.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    467.36 : 643.20 = 394.64 : x
  2. Step 2: Convert to fraction form
    467.36/643.20 = 394.64/x
  3. Step 3: Cross multiply
    467.36x = 643.20 × 394.64
  4. Step 4: Simplify right side
    467.36x = 253,832.45
  5. Step 5: Solve for x
    x = 253,832.45/467.36
  6. Step 6: Final answer
    x = 543.12

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.