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Finding the Fourth Proportional to 86.26, 129.50 and 72.83

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Solution

The fourth proportional to 86.26, 129.50 and 72.83 is: 109.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.26 : 129.50 = 72.83 : x
  2. Step 2: Convert to fraction form
    86.26/129.50 = 72.83/x
  3. Step 3: Cross multiply
    86.26x = 129.50 × 72.83
  4. Step 4: Simplify right side
    86.26x = 9,431.12
  5. Step 5: Solve for x
    x = 9,431.12/86.26
  6. Step 6: Final answer
    x = 109.34

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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.