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Finding the Fourth Proportional to 636.11, 955.76 and 405.10

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Solution

The fourth proportional to 636.11, 955.76 and 405.10 is: 608.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    636.11 : 955.76 = 405.10 : x
  2. Step 2: Convert to fraction form
    636.11/955.76 = 405.10/x
  3. Step 3: Cross multiply
    636.11x = 955.76 × 405.10
  4. Step 4: Simplify right side
    636.11x = 387,178.38
  5. Step 5: Solve for x
    x = 387,178.38/636.11
  6. Step 6: Final answer
    x = 608.67

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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.