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Finding the Fourth Proportional to 187.21, 279.05 and 172.33

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Solution

The fourth proportional to 187.21, 279.05 and 172.33 is: 256.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.21 : 279.05 = 172.33 : x
  2. Step 2: Convert to fraction form
    187.21/279.05 = 172.33/x
  3. Step 3: Cross multiply
    187.21x = 279.05 × 172.33
  4. Step 4: Simplify right side
    187.21x = 48,087.13
  5. Step 5: Solve for x
    x = 48,087.13/187.21
  6. Step 6: Final answer
    x = 256.86

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.