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Finding the Fourth Proportional to 185.99, 278.70 and 147.31

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Solution

The fourth proportional to 185.99, 278.70 and 147.31 is: 220.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    185.99 : 278.70 = 147.31 : x
  2. Step 2: Convert to fraction form
    185.99/278.70 = 147.31/x
  3. Step 3: Cross multiply
    185.99x = 278.70 × 147.31
  4. Step 4: Simplify right side
    185.99x = 41,053.17
  5. Step 5: Solve for x
    x = 41,053.17/185.99
  6. Step 6: Final answer
    x = 220.73

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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.