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Finding the Fourth Proportional to 389.47, 537.48 and 223.69

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Solution

The fourth proportional to 389.47, 537.48 and 223.69 is: 308.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.47 : 537.48 = 223.69 : x
  2. Step 2: Convert to fraction form
    389.47/537.48 = 223.69/x
  3. Step 3: Cross multiply
    389.47x = 537.48 × 223.69
  4. Step 4: Simplify right side
    389.47x = 120,228.90
  5. Step 5: Solve for x
    x = 120,228.90/389.47
  6. Step 6: Final answer
    x = 308.70

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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.