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Finding the Fourth Proportional to 309.90, 465.20 and 127.41

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Solution

The fourth proportional to 309.90, 465.20 and 127.41 is: 191.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.90 : 465.20 = 127.41 : x
  2. Step 2: Convert to fraction form
    309.90/465.20 = 127.41/x
  3. Step 3: Cross multiply
    309.90x = 465.20 × 127.41
  4. Step 4: Simplify right side
    309.90x = 59,270.49
  5. Step 5: Solve for x
    x = 59,270.49/309.90
  6. Step 6: Final answer
    x = 191.26

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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.