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Finding the Fourth Proportional to 172.40, 237.72 and 139.28

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Solution

The fourth proportional to 172.40, 237.72 and 139.28 is: 192.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.40 : 237.72 = 139.28 : x
  2. Step 2: Convert to fraction form
    172.40/237.72 = 139.28/x
  3. Step 3: Cross multiply
    172.40x = 237.72 × 139.28
  4. Step 4: Simplify right side
    172.40x = 33,109.64
  5. Step 5: Solve for x
    x = 33,109.64/172.40
  6. Step 6: Final answer
    x = 192.05

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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.