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Finding the Fourth Proportional to 461.25, 636.47 and 274.78

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Solution

The fourth proportional to 461.25, 636.47 and 274.78 is: 379.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    461.25 : 636.47 = 274.78 : x
  2. Step 2: Convert to fraction form
    461.25/636.47 = 274.78/x
  3. Step 3: Cross multiply
    461.25x = 636.47 × 274.78
  4. Step 4: Simplify right side
    461.25x = 174,886.04
  5. Step 5: Solve for x
    x = 174,886.04/461.25
  6. Step 6: Final answer
    x = 379.16

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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.