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Finding the Fourth Proportional to 461.36, 636.18 and 391.70

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Solution

The fourth proportional to 461.36, 636.18 and 391.70 is: 540.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    461.36 : 636.18 = 391.70 : x
  2. Step 2: Convert to fraction form
    461.36/636.18 = 391.70/x
  3. Step 3: Cross multiply
    461.36x = 636.18 × 391.70
  4. Step 4: Simplify right side
    461.36x = 249,191.71
  5. Step 5: Solve for x
    x = 249,191.71/461.36
  6. Step 6: Final answer
    x = 540.12

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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.