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Finding the Fourth Proportional to 127.58, 175.80 and 121.18

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Solution

The fourth proportional to 127.58, 175.80 and 121.18 is: 166.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.58 : 175.80 = 121.18 : x
  2. Step 2: Convert to fraction form
    127.58/175.80 = 121.18/x
  3. Step 3: Cross multiply
    127.58x = 175.80 × 121.18
  4. Step 4: Simplify right side
    127.58x = 21,303.44
  5. Step 5: Solve for x
    x = 21,303.44/127.58
  6. Step 6: Final answer
    x = 166.98

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.