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Finding the Fourth Proportional to 312.58, 468.60 and 168.40

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Solution

The fourth proportional to 312.58, 468.60 and 168.40 is: 252.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.58 : 468.60 = 168.40 : x
  2. Step 2: Convert to fraction form
    312.58/468.60 = 168.40/x
  3. Step 3: Cross multiply
    312.58x = 468.60 × 168.40
  4. Step 4: Simplify right side
    312.58x = 78,912.24
  5. Step 5: Solve for x
    x = 78,912.24/312.58
  6. Step 6: Final answer
    x = 252.45

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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.