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Finding the Fourth Proportional to 143.42, 214.07 and 128.84

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Solution

The fourth proportional to 143.42, 214.07 and 128.84 is: 192.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.42 : 214.07 = 128.84 : x
  2. Step 2: Convert to fraction form
    143.42/214.07 = 128.84/x
  3. Step 3: Cross multiply
    143.42x = 214.07 × 128.84
  4. Step 4: Simplify right side
    143.42x = 27,580.78
  5. Step 5: Solve for x
    x = 27,580.78/143.42
  6. Step 6: Final answer
    x = 192.31

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.