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Finding the Fourth Proportional to 172.12, 237.36 and 130.68

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Solution

The fourth proportional to 172.12, 237.36 and 130.68 is: 180.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.12 : 237.36 = 130.68 : x
  2. Step 2: Convert to fraction form
    172.12/237.36 = 130.68/x
  3. Step 3: Cross multiply
    172.12x = 237.36 × 130.68
  4. Step 4: Simplify right side
    172.12x = 31,018.20
  5. Step 5: Solve for x
    x = 31,018.20/172.12
  6. Step 6: Final answer
    x = 180.21

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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.