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Finding the Fourth Proportional to 185.72, 278.72 and 89.56

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Solution

The fourth proportional to 185.72, 278.72 and 89.56 is: 134.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    185.72 : 278.72 = 89.56 : x
  2. Step 2: Convert to fraction form
    185.72/278.72 = 89.56/x
  3. Step 3: Cross multiply
    185.72x = 278.72 × 89.56
  4. Step 4: Simplify right side
    185.72x = 24,962.16
  5. Step 5: Solve for x
    x = 24,962.16/185.72
  6. Step 6: Final answer
    x = 134.41

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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.