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Finding the Fourth Proportional to 603.34, 905.28 and 278.80

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Solution

The fourth proportional to 603.34, 905.28 and 278.80 is: 418.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    603.34 : 905.28 = 278.80 : x
  2. Step 2: Convert to fraction form
    603.34/905.28 = 278.80/x
  3. Step 3: Cross multiply
    603.34x = 905.28 × 278.80
  4. Step 4: Simplify right side
    603.34x = 252,392.06
  5. Step 5: Solve for x
    x = 252,392.06/603.34
  6. Step 6: Final answer
    x = 418.32

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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.