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Finding the Fourth Proportional to 387.03, 534.05 and 221.23

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Solution

The fourth proportional to 387.03, 534.05 and 221.23 is: 305.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.03 : 534.05 = 221.23 : x
  2. Step 2: Convert to fraction form
    387.03/534.05 = 221.23/x
  3. Step 3: Cross multiply
    387.03x = 534.05 × 221.23
  4. Step 4: Simplify right side
    387.03x = 118,147.88
  5. Step 5: Solve for x
    x = 118,147.88/387.03
  6. Step 6: Final answer
    x = 305.27

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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.