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Finding the Fourth Proportional to 125.61, 172.34 and 122.19

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Solution

The fourth proportional to 125.61, 172.34 and 122.19 is: 167.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.61 : 172.34 = 122.19 : x
  2. Step 2: Convert to fraction form
    125.61/172.34 = 122.19/x
  3. Step 3: Cross multiply
    125.61x = 172.34 × 122.19
  4. Step 4: Simplify right side
    125.61x = 21,057.61
  5. Step 5: Solve for x
    x = 21,057.61/125.61
  6. Step 6: Final answer
    x = 167.64

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.