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Finding the Fourth Proportional to 455.32, 628.28 and 280.64

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Solution

The fourth proportional to 455.32, 628.28 and 280.64 is: 387.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.32 : 628.28 = 280.64 : x
  2. Step 2: Convert to fraction form
    455.32/628.28 = 280.64/x
  3. Step 3: Cross multiply
    455.32x = 628.28 × 280.64
  4. Step 4: Simplify right side
    455.32x = 176,320.50
  5. Step 5: Solve for x
    x = 176,320.50/455.32
  6. Step 6: Final answer
    x = 387.25

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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.