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Finding the Fourth Proportional to 455.54, 628.52 and 315.50

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Solution

The fourth proportional to 455.54, 628.52 and 315.50 is: 435.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.54 : 628.52 = 315.50 : x
  2. Step 2: Convert to fraction form
    455.54/628.52 = 315.50/x
  3. Step 3: Cross multiply
    455.54x = 628.52 × 315.50
  4. Step 4: Simplify right side
    455.54x = 198,293.34
  5. Step 5: Solve for x
    x = 198,293.34/455.54
  6. Step 6: Final answer
    x = 435.30

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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.