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Finding the Fourth Proportional to 245.55, 368.41 and 123.78

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Solution

The fourth proportional to 245.55, 368.41 and 123.78 is: 185.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    245.55 : 368.41 = 123.78 : x
  2. Step 2: Convert to fraction form
    245.55/368.41 = 123.78/x
  3. Step 3: Cross multiply
    245.55x = 368.41 × 123.78
  4. Step 4: Simplify right side
    245.55x = 45,601.17
  5. Step 5: Solve for x
    x = 45,601.17/245.55
  6. Step 6: Final answer
    x = 185.71

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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.