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Finding the Fourth Proportional to 312.30, 468.72 and 225.90

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Solution

The fourth proportional to 312.30, 468.72 and 225.90 is: 339.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.30 : 468.72 = 225.90 : x
  2. Step 2: Convert to fraction form
    312.30/468.72 = 225.90/x
  3. Step 3: Cross multiply
    312.30x = 468.72 × 225.90
  4. Step 4: Simplify right side
    312.30x = 105,883.85
  5. Step 5: Solve for x
    x = 105,883.85/312.30
  6. Step 6: Final answer
    x = 339.05

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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.