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Finding the Fourth Proportional to 386.98, 534.01 and 221.20

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Solution

The fourth proportional to 386.98, 534.01 and 221.20 is: 305.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.98 : 534.01 = 221.20 : x
  2. Step 2: Convert to fraction form
    386.98/534.01 = 221.20/x
  3. Step 3: Cross multiply
    386.98x = 534.01 × 221.20
  4. Step 4: Simplify right side
    386.98x = 118,123.01
  5. Step 5: Solve for x
    x = 118,123.01/386.98
  6. Step 6: Final answer
    x = 305.24

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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.