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Finding the Fourth Proportional to 86.50, 129.77 and 29.50

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Solution

The fourth proportional to 86.50, 129.77 and 29.50 is: 44.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.50 : 129.77 = 29.50 : x
  2. Step 2: Convert to fraction form
    86.50/129.77 = 29.50/x
  3. Step 3: Cross multiply
    86.50x = 129.77 × 29.50
  4. Step 4: Simplify right side
    86.50x = 3,828.22
  5. Step 5: Solve for x
    x = 3,828.22/86.50
  6. Step 6: Final answer
    x = 44.26

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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.