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Finding the Fourth Proportional to 455.08, 628.52 and 315.40

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Solution

The fourth proportional to 455.08, 628.52 and 315.40 is: 435.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.08 : 628.52 = 315.40 : x
  2. Step 2: Convert to fraction form
    455.08/628.52 = 315.40/x
  3. Step 3: Cross multiply
    455.08x = 628.52 × 315.40
  4. Step 4: Simplify right side
    455.08x = 198,235.21
  5. Step 5: Solve for x
    x = 198,235.21/455.08
  6. Step 6: Final answer
    x = 435.61

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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.