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Finding the Fourth Proportional to 636.07, 877.94 and 399.91

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Solution

The fourth proportional to 636.07, 877.94 and 399.91 is: 551.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    636.07 : 877.94 = 399.91 : x
  2. Step 2: Convert to fraction form
    636.07/877.94 = 399.91/x
  3. Step 3: Cross multiply
    636.07x = 877.94 × 399.91
  4. Step 4: Simplify right side
    636.07x = 351,096.99
  5. Step 5: Solve for x
    x = 351,096.99/636.07
  6. Step 6: Final answer
    x = 551.98

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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.