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Finding the Fourth Proportional to 209.68, 314.52 and 86.26

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Solution

The fourth proportional to 209.68, 314.52 and 86.26 is: 129.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.68 : 314.52 = 86.26 : x
  2. Step 2: Convert to fraction form
    209.68/314.52 = 86.26/x
  3. Step 3: Cross multiply
    209.68x = 314.52 × 86.26
  4. Step 4: Simplify right side
    209.68x = 27,128.92
  5. Step 5: Solve for x
    x = 27,128.92/209.68
  6. Step 6: Final answer
    x = 129.38

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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.