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Finding the Fourth Proportional to 185.81, 278.46 and 123.98

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Solution

The fourth proportional to 185.81, 278.46 and 123.98 is: 185.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    185.81 : 278.46 = 123.98 : x
  2. Step 2: Convert to fraction form
    185.81/278.46 = 123.98/x
  3. Step 3: Cross multiply
    185.81x = 278.46 × 123.98
  4. Step 4: Simplify right side
    185.81x = 34,522.08
  5. Step 5: Solve for x
    x = 34,522.08/185.81
  6. Step 6: Final answer
    x = 185.80

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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.