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Finding the Fourth Proportional to 143.46, 216.21 and 142.08

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Solution

The fourth proportional to 143.46, 216.21 and 142.08 is: 214.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.46 : 216.21 = 142.08 : x
  2. Step 2: Convert to fraction form
    143.46/216.21 = 142.08/x
  3. Step 3: Cross multiply
    143.46x = 216.21 × 142.08
  4. Step 4: Simplify right side
    143.46x = 30,719.12
  5. Step 5: Solve for x
    x = 30,719.12/143.46
  6. Step 6: Final answer
    x = 214.13

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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.