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Finding the Fourth Proportional to 187.74, 280.80 and 153.72

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Solution

The fourth proportional to 187.74, 280.80 and 153.72 is: 229.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.74 : 280.80 = 153.72 : x
  2. Step 2: Convert to fraction form
    187.74/280.80 = 153.72/x
  3. Step 3: Cross multiply
    187.74x = 280.80 × 153.72
  4. Step 4: Simplify right side
    187.74x = 43,164.58
  5. Step 5: Solve for x
    x = 43,164.58/187.74
  6. Step 6: Final answer
    x = 229.92

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.