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Finding the Fourth Proportional to 485.76, 728.46 and 416.28

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Solution

The fourth proportional to 485.76, 728.46 and 416.28 is: 624.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.76 : 728.46 = 416.28 : x
  2. Step 2: Convert to fraction form
    485.76/728.46 = 416.28/x
  3. Step 3: Cross multiply
    485.76x = 728.46 × 416.28
  4. Step 4: Simplify right side
    485.76x = 303,243.33
  5. Step 5: Solve for x
    x = 303,243.33/485.76
  6. Step 6: Final answer
    x = 624.27

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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.