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Finding the Fourth Proportional to 172.22, 237.65 and 128.50

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Solution

The fourth proportional to 172.22, 237.65 and 128.50 is: 177.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.22 : 237.65 = 128.50 : x
  2. Step 2: Convert to fraction form
    172.22/237.65 = 128.50/x
  3. Step 3: Cross multiply
    172.22x = 237.65 × 128.50
  4. Step 4: Simplify right side
    172.22x = 30,538.03
  5. Step 5: Solve for x
    x = 30,538.03/172.22
  6. Step 6: Final answer
    x = 177.32

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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.