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Finding the Fourth Proportional to 455.40, 628.20 and 400.14

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Solution

The fourth proportional to 455.40, 628.20 and 400.14 is: 551.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.40 : 628.20 = 400.14 : x
  2. Step 2: Convert to fraction form
    455.40/628.20 = 400.14/x
  3. Step 3: Cross multiply
    455.40x = 628.20 × 400.14
  4. Step 4: Simplify right side
    455.40x = 251,367.95
  5. Step 5: Solve for x
    x = 251,367.95/455.40
  6. Step 6: Final answer
    x = 551.97

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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.