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Finding the Fourth Proportional to 636.02, 877.40 and 399.85

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Solution

The fourth proportional to 636.02, 877.40 and 399.85 is: 551.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    636.02 : 877.40 = 399.85 : x
  2. Step 2: Convert to fraction form
    636.02/877.40 = 399.85/x
  3. Step 3: Cross multiply
    636.02x = 877.40 × 399.85
  4. Step 4: Simplify right side
    636.02x = 350,830.63
  5. Step 5: Solve for x
    x = 350,830.63/636.02
  6. Step 6: Final answer
    x = 551.60

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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.