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Finding the Fourth Proportional to 385.99, 579.12 and 223.63

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Solution

The fourth proportional to 385.99, 579.12 and 223.63 is: 335.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.99 : 579.12 = 223.63 : x
  2. Step 2: Convert to fraction form
    385.99/579.12 = 223.63/x
  3. Step 3: Cross multiply
    385.99x = 579.12 × 223.63
  4. Step 4: Simplify right side
    385.99x = 129,508.61
  5. Step 5: Solve for x
    x = 129,508.61/385.99
  6. Step 6: Final answer
    x = 335.52

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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.