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Finding the Fourth Proportional to 461.36, 636.36 and 391.88

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Solution

The fourth proportional to 461.36, 636.36 and 391.88 is: 540.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    461.36 : 636.36 = 391.88 : x
  2. Step 2: Convert to fraction form
    461.36/636.36 = 391.88/x
  3. Step 3: Cross multiply
    461.36x = 636.36 × 391.88
  4. Step 4: Simplify right side
    461.36x = 249,376.76
  5. Step 5: Solve for x
    x = 249,376.76/461.36
  6. Step 6: Final answer
    x = 540.53

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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.