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Finding the Fourth Proportional to 210.92, 316.56 and 129.92

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Solution

The fourth proportional to 210.92, 316.56 and 129.92 is: 194.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.92 : 316.56 = 129.92 : x
  2. Step 2: Convert to fraction form
    210.92/316.56 = 129.92/x
  3. Step 3: Cross multiply
    210.92x = 316.56 × 129.92
  4. Step 4: Simplify right side
    210.92x = 41,127.48
  5. Step 5: Solve for x
    x = 41,127.48/210.92
  6. Step 6: Final answer
    x = 194.99

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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.