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Finding the Fourth Proportional to 187.45, 280.76 and 89.80

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Solution

The fourth proportional to 187.45, 280.76 and 89.80 is: 134.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.45 : 280.76 = 89.80 : x
  2. Step 2: Convert to fraction form
    187.45/280.76 = 89.80/x
  3. Step 3: Cross multiply
    187.45x = 280.76 × 89.80
  4. Step 4: Simplify right side
    187.45x = 25,211.10
  5. Step 5: Solve for x
    x = 25,211.10/187.45
  6. Step 6: Final answer
    x = 134.50

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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.