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Finding the Fourth Proportional to 480.60, 661.68 and 406.80

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Solution

The fourth proportional to 480.60, 661.68 and 406.80 is: 560.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    480.60 : 661.68 = 406.80 : x
  2. Step 2: Convert to fraction form
    480.60/661.68 = 406.80/x
  3. Step 3: Cross multiply
    480.60x = 661.68 × 406.80
  4. Step 4: Simplify right side
    480.60x = 269,171.42
  5. Step 5: Solve for x
    x = 269,171.42/480.60
  6. Step 6: Final answer
    x = 560.07

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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.