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Finding the Fourth Proportional to 386.64, 580.01 and 126.57

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Solution

The fourth proportional to 386.64, 580.01 and 126.57 is: 189.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.64 : 580.01 = 126.57 : x
  2. Step 2: Convert to fraction form
    386.64/580.01 = 126.57/x
  3. Step 3: Cross multiply
    386.64x = 580.01 × 126.57
  4. Step 4: Simplify right side
    386.64x = 73,412.18
  5. Step 5: Solve for x
    x = 73,412.18/386.64
  6. Step 6: Final answer
    x = 189.87

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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.