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Finding the Fourth Proportional to 455.35, 625.95 and 392.09

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Solution

The fourth proportional to 455.35, 625.95 and 392.09 is: 538.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.35 : 625.95 = 392.09 : x
  2. Step 2: Convert to fraction form
    455.35/625.95 = 392.09/x
  3. Step 3: Cross multiply
    455.35x = 625.95 × 392.09
  4. Step 4: Simplify right side
    455.35x = 245,426.78
  5. Step 5: Solve for x
    x = 245,426.78/455.35
  6. Step 6: Final answer
    x = 538.99

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.