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Finding the Fourth Proportional to 455.08, 628.02 and 258.55

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Solution

The fourth proportional to 455.08, 628.02 and 258.55 is: 356.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.08 : 628.02 = 258.55 : x
  2. Step 2: Convert to fraction form
    455.08/628.02 = 258.55/x
  3. Step 3: Cross multiply
    455.08x = 628.02 × 258.55
  4. Step 4: Simplify right side
    455.08x = 162,374.57
  5. Step 5: Solve for x
    x = 162,374.57/455.08
  6. Step 6: Final answer
    x = 356.80

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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.