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Finding the Fourth Proportional to 210.89, 316.35 and 66.57

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Solution

The fourth proportional to 210.89, 316.35 and 66.57 is: 99.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.89 : 316.35 = 66.57 : x
  2. Step 2: Convert to fraction form
    210.89/316.35 = 66.57/x
  3. Step 3: Cross multiply
    210.89x = 316.35 × 66.57
  4. Step 4: Simplify right side
    210.89x = 21,059.42
  5. Step 5: Solve for x
    x = 21,059.42/210.89
  6. Step 6: Final answer
    x = 99.86

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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.