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Finding the Fourth Proportional to 368.73, 508.83 and 221.31

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Solution

The fourth proportional to 368.73, 508.83 and 221.31 is: 305.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    368.73 : 508.83 = 221.31 : x
  2. Step 2: Convert to fraction form
    368.73/508.83 = 221.31/x
  3. Step 3: Cross multiply
    368.73x = 508.83 × 221.31
  4. Step 4: Simplify right side
    368.73x = 112,609.17
  5. Step 5: Solve for x
    x = 112,609.17/368.73
  6. Step 6: Final answer
    x = 305.40

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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.