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Finding the Fourth Proportional to 485.91, 669.83 and 415.44

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Solution

The fourth proportional to 485.91, 669.83 and 415.44 is: 572.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.91 : 669.83 = 415.44 : x
  2. Step 2: Convert to fraction form
    485.91/669.83 = 415.44/x
  3. Step 3: Cross multiply
    485.91x = 669.83 × 415.44
  4. Step 4: Simplify right side
    485.91x = 278,272.10
  5. Step 5: Solve for x
    x = 278,272.10/485.91
  6. Step 6: Final answer
    x = 572.68

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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.