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Finding the Fourth Proportional to 389.29, 537.36 and 306.77

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Solution

The fourth proportional to 389.29, 537.36 and 306.77 is: 423.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.29 : 537.36 = 306.77 : x
  2. Step 2: Convert to fraction form
    389.29/537.36 = 306.77/x
  3. Step 3: Cross multiply
    389.29x = 537.36 × 306.77
  4. Step 4: Simplify right side
    389.29x = 164,843.24
  5. Step 5: Solve for x
    x = 164,843.24/389.29
  6. Step 6: Final answer
    x = 423.45

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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.