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Finding the Fourth Proportional to 461.42, 636.30 and 391.67

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Solution

The fourth proportional to 461.42, 636.30 and 391.67 is: 540.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    461.42 : 636.30 = 391.67 : x
  2. Step 2: Convert to fraction form
    461.42/636.30 = 391.67/x
  3. Step 3: Cross multiply
    461.42x = 636.30 × 391.67
  4. Step 4: Simplify right side
    461.42x = 249,216.44
  5. Step 5: Solve for x
    x = 249,216.44/461.42
  6. Step 6: Final answer
    x = 540.11

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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.