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Finding the Fourth Proportional to 460.78, 635.72 and 274.21

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Solution

The fourth proportional to 460.78, 635.72 and 274.21 is: 378.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    460.78 : 635.72 = 274.21 : x
  2. Step 2: Convert to fraction form
    460.78/635.72 = 274.21/x
  3. Step 3: Cross multiply
    460.78x = 635.72 × 274.21
  4. Step 4: Simplify right side
    460.78x = 174,320.78
  5. Step 5: Solve for x
    x = 174,320.78/460.78
  6. Step 6: Final answer
    x = 378.32

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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.