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Finding the Fourth Proportional to 389.58, 537.60 and 223.80

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Solution

The fourth proportional to 389.58, 537.60 and 223.80 is: 308.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.58 : 537.60 = 223.80 : x
  2. Step 2: Convert to fraction form
    389.58/537.60 = 223.80/x
  3. Step 3: Cross multiply
    389.58x = 537.60 × 223.80
  4. Step 4: Simplify right side
    389.58x = 120,314.88
  5. Step 5: Solve for x
    x = 120,314.88/389.58
  6. Step 6: Final answer
    x = 308.83

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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.