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Finding the Fourth Proportional to 143.56, 198.30 and 129.70

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Solution

The fourth proportional to 143.56, 198.30 and 129.70 is: 179.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.56 : 198.30 = 129.70 : x
  2. Step 2: Convert to fraction form
    143.56/198.30 = 129.70/x
  3. Step 3: Cross multiply
    143.56x = 198.30 × 129.70
  4. Step 4: Simplify right side
    143.56x = 25,719.51
  5. Step 5: Solve for x
    x = 25,719.51/143.56
  6. Step 6: Final answer
    x = 179.16

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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.