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Finding the Fourth Proportional to 187.16, 280.85 and 77.45

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Solution

The fourth proportional to 187.16, 280.85 and 77.45 is: 116.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.16 : 280.85 = 77.45 : x
  2. Step 2: Convert to fraction form
    187.16/280.85 = 77.45/x
  3. Step 3: Cross multiply
    187.16x = 280.85 × 77.45
  4. Step 4: Simplify right side
    187.16x = 21,751.45
  5. Step 5: Solve for x
    x = 21,751.45/187.16
  6. Step 6: Final answer
    x = 116.22

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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.