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Finding the Fourth Proportional to 680.54, 1,020.20 and 407.16

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Solution

The fourth proportional to 680.54, 1,020.20 and 407.16 is: 610.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.54 : 1,020.20 = 407.16 : x
  2. Step 2: Convert to fraction form
    680.54/1,020.20 = 407.16/x
  3. Step 3: Cross multiply
    680.54x = 1,020.20 × 407.16
  4. Step 4: Simplify right side
    680.54x = 415,382.60
  5. Step 5: Solve for x
    x = 415,382.60/680.54
  6. Step 6: Final answer
    x = 610.38

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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.