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Finding the Fourth Proportional to 617.08, 850.62 and 485.86

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Solution

The fourth proportional to 617.08, 850.62 and 485.86 is: 669.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    617.08 : 850.62 = 485.86 : x
  2. Step 2: Convert to fraction form
    617.08/850.62 = 485.86/x
  3. Step 3: Cross multiply
    617.08x = 850.62 × 485.86
  4. Step 4: Simplify right side
    617.08x = 413,282.23
  5. Step 5: Solve for x
    x = 413,282.23/617.08
  6. Step 6: Final answer
    x = 669.74

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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.