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Finding the Fourth Proportional to 455.40, 628.45 and 258.91

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Solution

The fourth proportional to 455.40, 628.45 and 258.91 is: 357.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.40 : 628.45 = 258.91 : x
  2. Step 2: Convert to fraction form
    455.40/628.45 = 258.91/x
  3. Step 3: Cross multiply
    455.40x = 628.45 × 258.91
  4. Step 4: Simplify right side
    455.40x = 162,709.77
  5. Step 5: Solve for x
    x = 162,709.77/455.40
  6. Step 6: Final answer
    x = 357.29

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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.