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Finding the Fourth Proportional to 309.90, 465.12 and 127.29

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Solution

The fourth proportional to 309.90, 465.12 and 127.29 is: 191.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.90 : 465.12 = 127.29 : x
  2. Step 2: Convert to fraction form
    309.90/465.12 = 127.29/x
  3. Step 3: Cross multiply
    309.90x = 465.12 × 127.29
  4. Step 4: Simplify right side
    309.90x = 59,205.12
  5. Step 5: Solve for x
    x = 59,205.12/309.90
  6. Step 6: Final answer
    x = 191.05

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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.