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Finding the Fourth Proportional to 389.55, 537.65 and 223.87

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Solution

The fourth proportional to 389.55, 537.65 and 223.87 is: 308.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.55 : 537.65 = 223.87 : x
  2. Step 2: Convert to fraction form
    389.55/537.65 = 223.87/x
  3. Step 3: Cross multiply
    389.55x = 537.65 × 223.87
  4. Step 4: Simplify right side
    389.55x = 120,360.95
  5. Step 5: Solve for x
    x = 120,360.95/389.55
  6. Step 6: Final answer
    x = 308.98

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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.