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Finding the Fourth Proportional to 387.13, 534.15 and 221.29

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Solution

The fourth proportional to 387.13, 534.15 and 221.29 is: 305.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.13 : 534.15 = 221.29 : x
  2. Step 2: Convert to fraction form
    387.13/534.15 = 221.29/x
  3. Step 3: Cross multiply
    387.13x = 534.15 × 221.29
  4. Step 4: Simplify right side
    387.13x = 118,202.05
  5. Step 5: Solve for x
    x = 118,202.05/387.13
  6. Step 6: Final answer
    x = 305.33

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.