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Finding the Fourth Proportional to 575.10, 863.55 and 438.30

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Solution

The fourth proportional to 575.10, 863.55 and 438.30 is: 658.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    575.10 : 863.55 = 438.30 : x
  2. Step 2: Convert to fraction form
    575.10/863.55 = 438.30/x
  3. Step 3: Cross multiply
    575.10x = 863.55 × 438.30
  4. Step 4: Simplify right side
    575.10x = 378,493.97
  5. Step 5: Solve for x
    x = 378,493.97/575.10
  6. Step 6: Final answer
    x = 658.14

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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.