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Finding the Fourth Proportional to 199.70, 275.28 and 129.74

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Solution

The fourth proportional to 199.70, 275.28 and 129.74 is: 178.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    199.70 : 275.28 = 129.74 : x
  2. Step 2: Convert to fraction form
    199.70/275.28 = 129.74/x
  3. Step 3: Cross multiply
    199.70x = 275.28 × 129.74
  4. Step 4: Simplify right side
    199.70x = 35,714.83
  5. Step 5: Solve for x
    x = 35,714.83/199.70
  6. Step 6: Final answer
    x = 178.84

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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.