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Finding the Fourth Proportional to 210.82, 316.02 and 129.68

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Solution

The fourth proportional to 210.82, 316.02 and 129.68 is: 194.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.82 : 316.02 = 129.68 : x
  2. Step 2: Convert to fraction form
    210.82/316.02 = 129.68/x
  3. Step 3: Cross multiply
    210.82x = 316.02 × 129.68
  4. Step 4: Simplify right side
    210.82x = 40,981.47
  5. Step 5: Solve for x
    x = 40,981.47/210.82
  6. Step 6: Final answer
    x = 194.40

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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.