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Finding the Fourth Proportional to 455.13, 628.17 and 289.55

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Solution

The fourth proportional to 455.13, 628.17 and 289.55 is: 399.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.13 : 628.17 = 289.55 : x
  2. Step 2: Convert to fraction form
    455.13/628.17 = 289.55/x
  3. Step 3: Cross multiply
    455.13x = 628.17 × 289.55
  4. Step 4: Simplify right side
    455.13x = 181,883.48
  5. Step 5: Solve for x
    x = 181,883.48/455.13
  6. Step 6: Final answer
    x = 399.63

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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.