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Finding the Fourth Proportional to 603.88, 905.12 and 278.58

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Solution

The fourth proportional to 603.88, 905.12 and 278.58 is: 417.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    603.88 : 905.12 = 278.58 : x
  2. Step 2: Convert to fraction form
    603.88/905.12 = 278.58/x
  3. Step 3: Cross multiply
    603.88x = 905.12 × 278.58
  4. Step 4: Simplify right side
    603.88x = 252,148.33
  5. Step 5: Solve for x
    x = 252,148.33/603.88
  6. Step 6: Final answer
    x = 417.55

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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.