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Finding the Fourth Proportional to 127.08, 189.72 and 121.68

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Solution

The fourth proportional to 127.08, 189.72 and 121.68 is: 181.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.08 : 189.72 = 121.68 : x
  2. Step 2: Convert to fraction form
    127.08/189.72 = 121.68/x
  3. Step 3: Cross multiply
    127.08x = 189.72 × 121.68
  4. Step 4: Simplify right side
    127.08x = 23,085.13
  5. Step 5: Solve for x
    x = 23,085.13/127.08
  6. Step 6: Final answer
    x = 181.66

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.