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Finding the Fourth Proportional to 387.04, 580.71 and 271.21

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Solution

The fourth proportional to 387.04, 580.71 and 271.21 is: 406.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.04 : 580.71 = 271.21 : x
  2. Step 2: Convert to fraction form
    387.04/580.71 = 271.21/x
  3. Step 3: Cross multiply
    387.04x = 580.71 × 271.21
  4. Step 4: Simplify right side
    387.04x = 157,494.36
  5. Step 5: Solve for x
    x = 157,494.36/387.04
  6. Step 6: Final answer
    x = 406.92

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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.