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Finding the Fourth Proportional to 270.98, 406.45 and 76.00

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Solution

The fourth proportional to 270.98, 406.45 and 76.00 is: 113.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    270.98 : 406.45 = 76.00 : x
  2. Step 2: Convert to fraction form
    270.98/406.45 = 76.00/x
  3. Step 3: Cross multiply
    270.98x = 406.45 × 76.00
  4. Step 4: Simplify right side
    270.98x = 30,889.61
  5. Step 5: Solve for x
    x = 30,889.61/270.98
  6. Step 6: Final answer
    x = 113.99

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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.