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Finding the Fourth Proportional to 125.27, 172.77 and 81

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Solution

The fourth proportional to 125.27, 172.77 and 81 is: 111.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.27 : 172.77 = 81 : x
  2. Step 2: Convert to fraction form
    125.27/172.77 = 81/x
  3. Step 3: Cross multiply
    125.27x = 172.77 × 81
  4. Step 4: Simplify right side
    125.27x = 13,994.37
  5. Step 5: Solve for x
    x = 13,994.37/125.27
  6. Step 6: Final answer
    x = 111.72

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.