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Finding the Fourth Proportional to 210.96, 316.40 and 66.65

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Solution

The fourth proportional to 210.96, 316.40 and 66.65 is: 99.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.96 : 316.40 = 66.65 : x
  2. Step 2: Convert to fraction form
    210.96/316.40 = 66.65/x
  3. Step 3: Cross multiply
    210.96x = 316.40 × 66.65
  4. Step 4: Simplify right side
    210.96x = 21,086.14
  5. Step 5: Solve for x
    x = 21,086.14/210.96
  6. Step 6: Final answer
    x = 99.95

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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.