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Finding the Fourth Proportional to 905.60, 1,358.62 and 419

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Solution

The fourth proportional to 905.60, 1,358.62 and 419 is: 628.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.60 : 1,358.62 = 419 : x
  2. Step 2: Convert to fraction form
    905.60/1,358.62 = 419/x
  3. Step 3: Cross multiply
    905.60x = 1,358.62 × 419
  4. Step 4: Simplify right side
    905.60x = 569,261.78
  5. Step 5: Solve for x
    x = 569,261.78/905.60
  6. Step 6: Final answer
    x = 628.60

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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.