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Finding the Fourth Proportional to 143.15, 214.81 and 82.40

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Solution

The fourth proportional to 143.15, 214.81 and 82.40 is: 123.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.15 : 214.81 = 82.40 : x
  2. Step 2: Convert to fraction form
    143.15/214.81 = 82.40/x
  3. Step 3: Cross multiply
    143.15x = 214.81 × 82.40
  4. Step 4: Simplify right side
    143.15x = 17,699.06
  5. Step 5: Solve for x
    x = 17,699.06/143.15
  6. Step 6: Final answer
    x = 123.64

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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.