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Finding the Fourth Proportional to 143.51, 198.12 and 91.13

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Solution

The fourth proportional to 143.51, 198.12 and 91.13 is: 125.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.51 : 198.12 = 91.13 : x
  2. Step 2: Convert to fraction form
    143.51/198.12 = 91.13/x
  3. Step 3: Cross multiply
    143.51x = 198.12 × 91.13
  4. Step 4: Simplify right side
    143.51x = 18,053.23
  5. Step 5: Solve for x
    x = 18,053.23/143.51
  6. Step 6: Final answer
    x = 125.80

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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.