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Finding the Fourth Proportional to 127.06, 190.22 and 72.80

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Solution

The fourth proportional to 127.06, 190.22 and 72.80 is: 108.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.06 : 190.22 = 72.80 : x
  2. Step 2: Convert to fraction form
    127.06/190.22 = 72.80/x
  3. Step 3: Cross multiply
    127.06x = 190.22 × 72.80
  4. Step 4: Simplify right side
    127.06x = 13,848.02
  5. Step 5: Solve for x
    x = 13,848.02/127.06
  6. Step 6: Final answer
    x = 108.99

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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.