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Finding the Fourth Proportional to 455.59, 628.42 and 315.64

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Solution

The fourth proportional to 455.59, 628.42 and 315.64 is: 435.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.59 : 628.42 = 315.64 : x
  2. Step 2: Convert to fraction form
    455.59/628.42 = 315.64/x
  3. Step 3: Cross multiply
    455.59x = 628.42 × 315.64
  4. Step 4: Simplify right side
    455.59x = 198,354.49
  5. Step 5: Solve for x
    x = 198,354.49/455.59
  6. Step 6: Final answer
    x = 435.38

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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.