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Finding the Fourth Proportional to 905.84, 1,359.12 and 419

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Solution

The fourth proportional to 905.84, 1,359.12 and 419 is: 628.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.84 : 1,359.12 = 419 : x
  2. Step 2: Convert to fraction form
    905.84/1,359.12 = 419/x
  3. Step 3: Cross multiply
    905.84x = 1,359.12 × 419
  4. Step 4: Simplify right side
    905.84x = 569,471.28
  5. Step 5: Solve for x
    x = 569,471.28/905.84
  6. Step 6: Final answer
    x = 628.67

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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.