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Finding the Fourth Proportional to 465.36, 640.44 and 392.64

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Solution

The fourth proportional to 465.36, 640.44 and 392.64 is: 540.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    465.36 : 640.44 = 392.64 : x
  2. Step 2: Convert to fraction form
    465.36/640.44 = 392.64/x
  3. Step 3: Cross multiply
    465.36x = 640.44 × 392.64
  4. Step 4: Simplify right side
    465.36x = 251,462.36
  5. Step 5: Solve for x
    x = 251,462.36/465.36
  6. Step 6: Final answer
    x = 540.36

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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.