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Finding the Fourth Proportional to 370.77, 511.64 and 221.39

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Solution

The fourth proportional to 370.77, 511.64 and 221.39 is: 305.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    370.77 : 511.64 = 221.39 : x
  2. Step 2: Convert to fraction form
    370.77/511.64 = 221.39/x
  3. Step 3: Cross multiply
    370.77x = 511.64 × 221.39
  4. Step 4: Simplify right side
    370.77x = 113,270.87
  5. Step 5: Solve for x
    x = 113,270.87/370.77
  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.