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Finding the Fourth Proportional to 187.14, 257.40 and 157.98

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Solution

The fourth proportional to 187.14, 257.40 and 157.98 is: 217.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.14 : 257.40 = 157.98 : x
  2. Step 2: Convert to fraction form
    187.14/257.40 = 157.98/x
  3. Step 3: Cross multiply
    187.14x = 257.40 × 157.98
  4. Step 4: Simplify right side
    187.14x = 40,664.05
  5. Step 5: Solve for x
    x = 40,664.05/187.14
  6. Step 6: Final answer
    x = 217.29

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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.