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Finding the Fourth Proportional to 185.86, 278.91 and 140.30

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Solution

The fourth proportional to 185.86, 278.91 and 140.30 is: 210.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    185.86 : 278.91 = 140.30 : x
  2. Step 2: Convert to fraction form
    185.86/278.91 = 140.30/x
  3. Step 3: Cross multiply
    185.86x = 278.91 × 140.30
  4. Step 4: Simplify right side
    185.86x = 39,131.07
  5. Step 5: Solve for x
    x = 39,131.07/185.86
  6. Step 6: Final answer
    x = 210.54

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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.