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Finding the Fourth Proportional to 397.28, 596.05 and 123.40

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Solution

The fourth proportional to 397.28, 596.05 and 123.40 is: 185.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.28 : 596.05 = 123.40 : x
  2. Step 2: Convert to fraction form
    397.28/596.05 = 123.40/x
  3. Step 3: Cross multiply
    397.28x = 596.05 × 123.40
  4. Step 4: Simplify right side
    397.28x = 73,552.57
  5. Step 5: Solve for x
    x = 73,552.57/397.28
  6. Step 6: Final answer
    x = 185.14

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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.