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Finding the Fourth Proportional to 186.94, 280.43 and 78.72

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Solution

The fourth proportional to 186.94, 280.43 and 78.72 is: 118.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.94 : 280.43 = 78.72 : x
  2. Step 2: Convert to fraction form
    186.94/280.43 = 78.72/x
  3. Step 3: Cross multiply
    186.94x = 280.43 × 78.72
  4. Step 4: Simplify right side
    186.94x = 22,075.45
  5. Step 5: Solve for x
    x = 22,075.45/186.94
  6. Step 6: Final answer
    x = 118.09

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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.