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Finding the Fourth Proportional to 210.63, 315.47 and 129.29

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Solution

The fourth proportional to 210.63, 315.47 and 129.29 is: 193.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.63 : 315.47 = 129.29 : x
  2. Step 2: Convert to fraction form
    210.63/315.47 = 129.29/x
  3. Step 3: Cross multiply
    210.63x = 315.47 × 129.29
  4. Step 4: Simplify right side
    210.63x = 40,788.23
  5. Step 5: Solve for x
    x = 40,788.23/210.63
  6. Step 6: Final answer
    x = 193.65

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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.