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Finding the Fourth Proportional to 172.40, 238.35 and 130.89

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Solution

The fourth proportional to 172.40, 238.35 and 130.89 is: 180.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.40 : 238.35 = 130.89 : x
  2. Step 2: Convert to fraction form
    172.40/238.35 = 130.89/x
  3. Step 3: Cross multiply
    172.40x = 238.35 × 130.89
  4. Step 4: Simplify right side
    172.40x = 31,196.44
  5. Step 5: Solve for x
    x = 31,196.44/172.40
  6. Step 6: Final answer
    x = 180.96

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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.