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Finding the Fourth Proportional to 253.66, 380.20 and 123.57

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Solution

The fourth proportional to 253.66, 380.20 and 123.57 is: 185.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    253.66 : 380.20 = 123.57 : x
  2. Step 2: Convert to fraction form
    253.66/380.20 = 123.57/x
  3. Step 3: Cross multiply
    253.66x = 380.20 × 123.57
  4. Step 4: Simplify right side
    253.66x = 46,981.31
  5. Step 5: Solve for x
    x = 46,981.31/253.66
  6. Step 6: Final answer
    x = 185.21

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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.