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Finding the Fourth Proportional to 392.69, 541.62 and 287.66

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Solution

The fourth proportional to 392.69, 541.62 and 287.66 is: 396.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.69 : 541.62 = 287.66 : x
  2. Step 2: Convert to fraction form
    392.69/541.62 = 287.66/x
  3. Step 3: Cross multiply
    392.69x = 541.62 × 287.66
  4. Step 4: Simplify right side
    392.69x = 155,802.41
  5. Step 5: Solve for x
    x = 155,802.41/392.69
  6. Step 6: Final answer
    x = 396.76

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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.