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Finding the Fourth Proportional to 185.78, 278.42 and 89.40

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Solution

The fourth proportional to 185.78, 278.42 and 89.40 is: 133.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    185.78 : 278.42 = 89.40 : x
  2. Step 2: Convert to fraction form
    185.78/278.42 = 89.40/x
  3. Step 3: Cross multiply
    185.78x = 278.42 × 89.40
  4. Step 4: Simplify right side
    185.78x = 24,890.75
  5. Step 5: Solve for x
    x = 24,890.75/185.78
  6. Step 6: Final answer
    x = 133.98

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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.