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Finding the Fourth Proportional to 210.82, 316.29 and 66.55

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Solution

The fourth proportional to 210.82, 316.29 and 66.55 is: 99.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.82 : 316.29 = 66.55 : x
  2. Step 2: Convert to fraction form
    210.82/316.29 = 66.55/x
  3. Step 3: Cross multiply
    210.82x = 316.29 × 66.55
  4. Step 4: Simplify right side
    210.82x = 21,049.10
  5. Step 5: Solve for x
    x = 21,049.10/210.82
  6. Step 6: Final answer
    x = 99.84

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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.