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Finding the Fourth Proportional to 389.53, 537.93 and 249.91

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Solution

The fourth proportional to 389.53, 537.93 and 249.91 is: 345.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.53 : 537.93 = 249.91 : x
  2. Step 2: Convert to fraction form
    389.53/537.93 = 249.91/x
  3. Step 3: Cross multiply
    389.53x = 537.93 × 249.91
  4. Step 4: Simplify right side
    389.53x = 134,434.09
  5. Step 5: Solve for x
    x = 134,434.09/389.53
  6. Step 6: Final answer
    x = 345.12

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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.