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Finding the Fourth Proportional to 636.99, 957.08 and 405.98

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Solution

The fourth proportional to 636.99, 957.08 and 405.98 is: 609.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    636.99 : 957.08 = 405.98 : x
  2. Step 2: Convert to fraction form
    636.99/957.08 = 405.98/x
  3. Step 3: Cross multiply
    636.99x = 957.08 × 405.98
  4. Step 4: Simplify right side
    636.99x = 388,553.31
  5. Step 5: Solve for x
    x = 388,553.31/636.99
  6. Step 6: Final answer
    x = 609.99

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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.