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Finding the Fourth Proportional to 187.68, 280.14 and 172.29

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Solution

The fourth proportional to 187.68, 280.14 and 172.29 is: 257.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.68 : 280.14 = 172.29 : x
  2. Step 2: Convert to fraction form
    187.68/280.14 = 172.29/x
  3. Step 3: Cross multiply
    187.68x = 280.14 × 172.29
  4. Step 4: Simplify right side
    187.68x = 48,265.32
  5. Step 5: Solve for x
    x = 48,265.32/187.68
  6. Step 6: Final answer
    x = 257.17

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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.