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Finding the Fourth Proportional to 636.17, 877.57 and 400.05

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Solution

The fourth proportional to 636.17, 877.57 and 400.05 is: 551.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    636.17 : 877.57 = 400.05 : x
  2. Step 2: Convert to fraction form
    636.17/877.57 = 400.05/x
  3. Step 3: Cross multiply
    636.17x = 877.57 × 400.05
  4. Step 4: Simplify right side
    636.17x = 351,070.88
  5. Step 5: Solve for x
    x = 351,070.88/636.17
  6. Step 6: Final answer
    x = 551.86

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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.