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Finding the Fourth Proportional to 455.38, 628.86 and 392.62

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Solution

The fourth proportional to 455.38, 628.86 and 392.62 is: 542.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.38 : 628.86 = 392.62 : x
  2. Step 2: Convert to fraction form
    455.38/628.86 = 392.62/x
  3. Step 3: Cross multiply
    455.38x = 628.86 × 392.62
  4. Step 4: Simplify right side
    455.38x = 246,903.01
  5. Step 5: Solve for x
    x = 246,903.01/455.38
  6. Step 6: Final answer
    x = 542.19

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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.