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Finding the Fourth Proportional to 143.02, 214.80 and 85.42

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Solution

The fourth proportional to 143.02, 214.80 and 85.42 is: 128.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.02 : 214.80 = 85.42 : x
  2. Step 2: Convert to fraction form
    143.02/214.80 = 85.42/x
  3. Step 3: Cross multiply
    143.02x = 214.80 × 85.42
  4. Step 4: Simplify right side
    143.02x = 18,348.22
  5. Step 5: Solve for x
    x = 18,348.22/143.02
  6. Step 6: Final answer
    x = 128.29

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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.