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Finding the Fourth Proportional to 172.60, 238.32 and 156.16

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Solution

The fourth proportional to 172.60, 238.32 and 156.16 is: 215.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.60 : 238.32 = 156.16 : x
  2. Step 2: Convert to fraction form
    172.60/238.32 = 156.16/x
  3. Step 3: Cross multiply
    172.60x = 238.32 × 156.16
  4. Step 4: Simplify right side
    172.60x = 37,216.05
  5. Step 5: Solve for x
    x = 37,216.05/172.60
  6. Step 6: Final answer
    x = 215.62

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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.