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Finding the Fourth Proportional to 187.28, 279.58 and 155.12

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Solution

The fourth proportional to 187.28, 279.58 and 155.12 is: 231.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.28 : 279.58 = 155.12 : x
  2. Step 2: Convert to fraction form
    187.28/279.58 = 155.12/x
  3. Step 3: Cross multiply
    187.28x = 279.58 × 155.12
  4. Step 4: Simplify right side
    187.28x = 43,368.45
  5. Step 5: Solve for x
    x = 43,368.45/187.28
  6. Step 6: Final answer
    x = 231.57

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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.