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Finding the Fourth Proportional to 210.61, 315.63 and 129.43

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Solution

The fourth proportional to 210.61, 315.63 and 129.43 is: 193.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.61 : 315.63 = 129.43 : x
  2. Step 2: Convert to fraction form
    210.61/315.63 = 129.43/x
  3. Step 3: Cross multiply
    210.61x = 315.63 × 129.43
  4. Step 4: Simplify right side
    210.61x = 40,851.99
  5. Step 5: Solve for x
    x = 40,851.99/210.61
  6. Step 6: Final answer
    x = 193.97

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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.