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Finding the Fourth Proportional to 312.42, 468.28 and 190.42

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Solution

The fourth proportional to 312.42, 468.28 and 190.42 is: 285.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.42 : 468.28 = 190.42 : x
  2. Step 2: Convert to fraction form
    312.42/468.28 = 190.42/x
  3. Step 3: Cross multiply
    312.42x = 468.28 × 190.42
  4. Step 4: Simplify right side
    312.42x = 89,167.06
  5. Step 5: Solve for x
    x = 89,167.06/312.42
  6. Step 6: Final answer
    x = 285.41

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.