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Finding the Fourth Proportional to 392.70, 537.90 and 391.62

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Solution

The fourth proportional to 392.70, 537.90 and 391.62 is: 536.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.70 : 537.90 = 391.62 : x
  2. Step 2: Convert to fraction form
    392.70/537.90 = 391.62/x
  3. Step 3: Cross multiply
    392.70x = 537.90 × 391.62
  4. Step 4: Simplify right side
    392.70x = 210,652.40
  5. Step 5: Solve for x
    x = 210,652.40/392.70
  6. Step 6: Final answer
    x = 536.42

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.