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Finding the Fourth Proportional to 455.39, 628.35 and 315.28

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Solution

The fourth proportional to 455.39, 628.35 and 315.28 is: 435.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.39 : 628.35 = 315.28 : x
  2. Step 2: Convert to fraction form
    455.39/628.35 = 315.28/x
  3. Step 3: Cross multiply
    455.39x = 628.35 × 315.28
  4. Step 4: Simplify right side
    455.39x = 198,106.19
  5. Step 5: Solve for x
    x = 198,106.19/455.39
  6. Step 6: Final answer
    x = 435.03

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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.