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Finding the Fourth Proportional to 312.21, 468.72 and 190.71

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Solution

The fourth proportional to 312.21, 468.72 and 190.71 is: 286.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.21 : 468.72 = 190.71 : x
  2. Step 2: Convert to fraction form
    312.21/468.72 = 190.71/x
  3. Step 3: Cross multiply
    312.21x = 468.72 × 190.71
  4. Step 4: Simplify right side
    312.21x = 89,389.59
  5. Step 5: Solve for x
    x = 89,389.59/312.21
  6. Step 6: Final answer
    x = 286.31

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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.