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Finding the Fourth Proportional to 603.48, 905.50 and 431.26

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Solution

The fourth proportional to 603.48, 905.50 and 431.26 is: 647.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    603.48 : 905.50 = 431.26 : x
  2. Step 2: Convert to fraction form
    603.48/905.50 = 431.26/x
  3. Step 3: Cross multiply
    603.48x = 905.50 × 431.26
  4. Step 4: Simplify right side
    603.48x = 390,505.93
  5. Step 5: Solve for x
    x = 390,505.93/603.48
  6. Step 6: Final answer
    x = 647.09

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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.