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Finding the Fourth Proportional to 125.76, 172.98 and 120.72

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Solution

The fourth proportional to 125.76, 172.98 and 120.72 is: 166.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.76 : 172.98 = 120.72 : x
  2. Step 2: Convert to fraction form
    125.76/172.98 = 120.72/x
  3. Step 3: Cross multiply
    125.76x = 172.98 × 120.72
  4. Step 4: Simplify right side
    125.76x = 20,882.15
  5. Step 5: Solve for x
    x = 20,882.15/125.76
  6. Step 6: Final answer
    x = 166.05

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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.