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Finding the Fourth Proportional to 455.05, 627.94 and 280.39

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Solution

The fourth proportional to 455.05, 627.94 and 280.39 is: 386.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.05 : 627.94 = 280.39 : x
  2. Step 2: Convert to fraction form
    455.05/627.94 = 280.39/x
  3. Step 3: Cross multiply
    455.05x = 627.94 × 280.39
  4. Step 4: Simplify right side
    455.05x = 176,068.10
  5. Step 5: Solve for x
    x = 176,068.10/455.05
  6. Step 6: Final answer
    x = 386.92

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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.