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Finding the Fourth Proportional to 455.34, 628.65 and 408.63

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Solution

The fourth proportional to 455.34, 628.65 and 408.63 is: 564.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.34 : 628.65 = 408.63 : x
  2. Step 2: Convert to fraction form
    455.34/628.65 = 408.63/x
  3. Step 3: Cross multiply
    455.34x = 628.65 × 408.63
  4. Step 4: Simplify right side
    455.34x = 256,885.25
  5. Step 5: Solve for x
    x = 256,885.25/455.34
  6. Step 6: Final answer
    x = 564.16

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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.