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Finding the Fourth Proportional to 896.39, 1,344.71 and 319.13

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Solution

The fourth proportional to 896.39, 1,344.71 and 319.13 is: 478.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    896.39 : 1,344.71 = 319.13 : x
  2. Step 2: Convert to fraction form
    896.39/1,344.71 = 319.13/x
  3. Step 3: Cross multiply
    896.39x = 1,344.71 × 319.13
  4. Step 4: Simplify right side
    896.39x = 429,137.30
  5. Step 5: Solve for x
    x = 429,137.30/896.39
  6. Step 6: Final answer
    x = 478.74

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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.