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Finding the Fourth Proportional to 392.66, 543.05 and 351.14

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Solution

The fourth proportional to 392.66, 543.05 and 351.14 is: 485.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.66 : 543.05 = 351.14 : x
  2. Step 2: Convert to fraction form
    392.66/543.05 = 351.14/x
  3. Step 3: Cross multiply
    392.66x = 543.05 × 351.14
  4. Step 4: Simplify right side
    392.66x = 190,686.58
  5. Step 5: Solve for x
    x = 190,686.58/392.66
  6. Step 6: Final answer
    x = 485.63

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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.