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Finding the Fourth Proportional to 312.38, 468.64 and 156.29

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Solution

The fourth proportional to 312.38, 468.64 and 156.29 is: 234.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.38 : 468.64 = 156.29 : x
  2. Step 2: Convert to fraction form
    312.38/468.64 = 156.29/x
  3. Step 3: Cross multiply
    312.38x = 468.64 × 156.29
  4. Step 4: Simplify right side
    312.38x = 73,240.62
  5. Step 5: Solve for x
    x = 73,240.62/312.38
  6. Step 6: Final answer
    x = 234.46

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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.