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Finding the Fourth Proportional to 211.68, 316.44 and 142.92

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Solution

The fourth proportional to 211.68, 316.44 and 142.92 is: 213.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.68 : 316.44 = 142.92 : x
  2. Step 2: Convert to fraction form
    211.68/316.44 = 142.92/x
  3. Step 3: Cross multiply
    211.68x = 316.44 × 142.92
  4. Step 4: Simplify right side
    211.68x = 45,225.60
  5. Step 5: Solve for x
    x = 45,225.60/211.68
  6. Step 6: Final answer
    x = 213.65

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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.