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Finding the Fourth Proportional to 640.42, 959.88 and 485.83

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Solution

The fourth proportional to 640.42, 959.88 and 485.83 is: 728.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.42 : 959.88 = 485.83 : x
  2. Step 2: Convert to fraction form
    640.42/959.88 = 485.83/x
  3. Step 3: Cross multiply
    640.42x = 959.88 × 485.83
  4. Step 4: Simplify right side
    640.42x = 466,338.50
  5. Step 5: Solve for x
    x = 466,338.50/640.42
  6. Step 6: Final answer
    x = 728.18

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.