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Finding the Fourth Proportional to 312.88, 469.26 and 168.64

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Solution

The fourth proportional to 312.88, 469.26 and 168.64 is: 252.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.88 : 469.26 = 168.64 : x
  2. Step 2: Convert to fraction form
    312.88/469.26 = 168.64/x
  3. Step 3: Cross multiply
    312.88x = 469.26 × 168.64
  4. Step 4: Simplify right side
    312.88x = 79,136.01
  5. Step 5: Solve for x
    x = 79,136.01/312.88
  6. Step 6: Final answer
    x = 252.93

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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.