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Finding the Fourth Proportional to 125.05, 172.55 and 69.78

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Solution

The fourth proportional to 125.05, 172.55 and 69.78 is: 96.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.05 : 172.55 = 69.78 : x
  2. Step 2: Convert to fraction form
    125.05/172.55 = 69.78/x
  3. Step 3: Cross multiply
    125.05x = 172.55 × 69.78
  4. Step 4: Simplify right side
    125.05x = 12,040.54
  5. Step 5: Solve for x
    x = 12,040.54/125.05
  6. Step 6: Final answer
    x = 96.29

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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.