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Finding the Fourth Proportional to 172.20, 236.58 and 139.35

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Solution

The fourth proportional to 172.20, 236.58 and 139.35 is: 191.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.20 : 236.58 = 139.35 : x
  2. Step 2: Convert to fraction form
    172.20/236.58 = 139.35/x
  3. Step 3: Cross multiply
    172.20x = 236.58 × 139.35
  4. Step 4: Simplify right side
    172.20x = 32,967.42
  5. Step 5: Solve for x
    x = 32,967.42/172.20
  6. Step 6: Final answer
    x = 191.45

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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.