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Finding the Fourth Proportional to 143.68, 216.64 and 131.68

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Solution

The fourth proportional to 143.68, 216.64 and 131.68 is: 198.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.68 : 216.64 = 131.68 : x
  2. Step 2: Convert to fraction form
    143.68/216.64 = 131.68/x
  3. Step 3: Cross multiply
    143.68x = 216.64 × 131.68
  4. Step 4: Simplify right side
    143.68x = 28,527.16
  5. Step 5: Solve for x
    x = 28,527.16/143.68
  6. Step 6: Final answer
    x = 198.55

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.