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Finding the Fourth Proportional to 407.78, 610.50 and 270.55

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Solution

The fourth proportional to 407.78, 610.50 and 270.55 is: 405.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.78 : 610.50 = 270.55 : x
  2. Step 2: Convert to fraction form
    407.78/610.50 = 270.55/x
  3. Step 3: Cross multiply
    407.78x = 610.50 × 270.55
  4. Step 4: Simplify right side
    407.78x = 165,172.55
  5. Step 5: Solve for x
    x = 165,172.55/407.78
  6. Step 6: Final answer
    x = 405.05

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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.