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Finding the Fourth Proportional to 187.68, 280.15 and 172.30

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Solution

The fourth proportional to 187.68, 280.15 and 172.30 is: 257.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.68 : 280.15 = 172.30 : x
  2. Step 2: Convert to fraction form
    187.68/280.15 = 172.30/x
  3. Step 3: Cross multiply
    187.68x = 280.15 × 172.30
  4. Step 4: Simplify right side
    187.68x = 48,269.85
  5. Step 5: Solve for x
    x = 48,269.85/187.68
  6. Step 6: Final answer
    x = 257.19

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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.