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Finding the Fourth Proportional to 636.49, 953.86 and 389.77

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Solution

The fourth proportional to 636.49, 953.86 and 389.77 is: 584.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    636.49 : 953.86 = 389.77 : x
  2. Step 2: Convert to fraction form
    636.49/953.86 = 389.77/x
  3. Step 3: Cross multiply
    636.49x = 953.86 × 389.77
  4. Step 4: Simplify right side
    636.49x = 371,786.01
  5. Step 5: Solve for x
    x = 371,786.01/636.49
  6. Step 6: Final answer
    x = 584.12

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.