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Finding the Fourth Proportional to 896.12, 1,344.80 and 319

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Solution

The fourth proportional to 896.12, 1,344.80 and 319 is: 478.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    896.12 : 1,344.80 = 319 : x
  2. Step 2: Convert to fraction form
    896.12/1,344.80 = 319/x
  3. Step 3: Cross multiply
    896.12x = 1,344.80 × 319
  4. Step 4: Simplify right side
    896.12x = 428,991.20
  5. Step 5: Solve for x
    x = 428,991.20/896.12
  6. Step 6: Final answer
    x = 478.72

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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.