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Finding the Fourth Proportional to 185.90, 278.81 and 89.66

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Solution

The fourth proportional to 185.90, 278.81 and 89.66 is: 134.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    185.90 : 278.81 = 89.66 : x
  2. Step 2: Convert to fraction form
    185.90/278.81 = 89.66/x
  3. Step 3: Cross multiply
    185.90x = 278.81 × 89.66
  4. Step 4: Simplify right side
    185.90x = 24,998.10
  5. Step 5: Solve for x
    x = 24,998.10/185.90
  6. Step 6: Final answer
    x = 134.47

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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.