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Finding the Fourth Proportional to 407.20, 610.80 and 403.60

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Solution

The fourth proportional to 407.20, 610.80 and 403.60 is: 605.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.20 : 610.80 = 403.60 : x
  2. Step 2: Convert to fraction form
    407.20/610.80 = 403.60/x
  3. Step 3: Cross multiply
    407.20x = 610.80 × 403.60
  4. Step 4: Simplify right side
    407.20x = 246,518.88
  5. Step 5: Solve for x
    x = 246,518.88/407.20
  6. Step 6: Final answer
    x = 605.40

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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.