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Finding the Fourth Proportional to 143.09, 214.25 and 91.45

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Solution

The fourth proportional to 143.09, 214.25 and 91.45 is: 136.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.09 : 214.25 = 91.45 : x
  2. Step 2: Convert to fraction form
    143.09/214.25 = 91.45/x
  3. Step 3: Cross multiply
    143.09x = 214.25 × 91.45
  4. Step 4: Simplify right side
    143.09x = 19,593.16
  5. Step 5: Solve for x
    x = 19,593.16/143.09
  6. Step 6: Final answer
    x = 136.93

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.