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Finding the Fourth Proportional to 370.82, 511.67 and 221.40

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Solution

The fourth proportional to 370.82, 511.67 and 221.40 is: 305.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    370.82 : 511.67 = 221.40 : x
  2. Step 2: Convert to fraction form
    370.82/511.67 = 221.40/x
  3. Step 3: Cross multiply
    370.82x = 511.67 × 221.40
  4. Step 4: Simplify right side
    370.82x = 113,283.74
  5. Step 5: Solve for x
    x = 113,283.74/370.82
  6. Step 6: Final answer
    x = 305.50

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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.