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Finding the Fourth Proportional to 438.12, 603.72 and 321.48

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Solution

The fourth proportional to 438.12, 603.72 and 321.48 is: 442.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.12 : 603.72 = 321.48 : x
  2. Step 2: Convert to fraction form
    438.12/603.72 = 321.48/x
  3. Step 3: Cross multiply
    438.12x = 603.72 × 321.48
  4. Step 4: Simplify right side
    438.12x = 194,083.91
  5. Step 5: Solve for x
    x = 194,083.91/438.12
  6. Step 6: Final answer
    x = 442.99

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.