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Finding the Fourth Proportional to 603.96, 905.40 and 421.80

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Solution

The fourth proportional to 603.96, 905.40 and 421.80 is: 632.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    603.96 : 905.40 = 421.80 : x
  2. Step 2: Convert to fraction form
    603.96/905.40 = 421.80/x
  3. Step 3: Cross multiply
    603.96x = 905.40 × 421.80
  4. Step 4: Simplify right side
    603.96x = 381,897.72
  5. Step 5: Solve for x
    x = 381,897.72/603.96
  6. Step 6: Final answer
    x = 632.32

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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.