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Finding the Fourth Proportional to 392.14, 540.66 and 287.14

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Solution

The fourth proportional to 392.14, 540.66 and 287.14 is: 395.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.14 : 540.66 = 287.14 : x
  2. Step 2: Convert to fraction form
    392.14/540.66 = 287.14/x
  3. Step 3: Cross multiply
    392.14x = 540.66 × 287.14
  4. Step 4: Simplify right side
    392.14x = 155,245.11
  5. Step 5: Solve for x
    x = 155,245.11/392.14
  6. Step 6: Final answer
    x = 395.89

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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.