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Finding the Fourth Proportional to 127.08, 190.65 and 66.21

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Solution

The fourth proportional to 127.08, 190.65 and 66.21 is: 99.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.08 : 190.65 = 66.21 : x
  2. Step 2: Convert to fraction form
    127.08/190.65 = 66.21/x
  3. Step 3: Cross multiply
    127.08x = 190.65 × 66.21
  4. Step 4: Simplify right side
    127.08x = 12,622.94
  5. Step 5: Solve for x
    x = 12,622.94/127.08
  6. Step 6: Final answer
    x = 99.33

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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.