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Finding the Fourth Proportional to 439.56, 603.05 and 428.76

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Solution

The fourth proportional to 439.56, 603.05 and 428.76 is: 588.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.56 : 603.05 = 428.76 : x
  2. Step 2: Convert to fraction form
    439.56/603.05 = 428.76/x
  3. Step 3: Cross multiply
    439.56x = 603.05 × 428.76
  4. Step 4: Simplify right side
    439.56x = 258,561.57
  5. Step 5: Solve for x
    x = 258,561.57/439.56
  6. Step 6: Final answer
    x = 588.23

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.