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Finding the Fourth Proportional to 125.21, 172.06 and 113.06

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Solution

The fourth proportional to 125.21, 172.06 and 113.06 is: 155.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.21 : 172.06 = 113.06 : x
  2. Step 2: Convert to fraction form
    125.21/172.06 = 113.06/x
  3. Step 3: Cross multiply
    125.21x = 172.06 × 113.06
  4. Step 4: Simplify right side
    125.21x = 19,453.25
  5. Step 5: Solve for x
    x = 19,453.25/125.21
  6. Step 6: Final answer
    x = 155.36

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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.