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Finding the Fourth Proportional to 368.87, 509.17 and 221.59

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Solution

The fourth proportional to 368.87, 509.17 and 221.59 is: 305.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    368.87 : 509.17 = 221.59 : x
  2. Step 2: Convert to fraction form
    368.87/509.17 = 221.59/x
  3. Step 3: Cross multiply
    368.87x = 509.17 × 221.59
  4. Step 4: Simplify right side
    368.87x = 112,824.43
  5. Step 5: Solve for x
    x = 112,824.43/368.87
  6. Step 6: Final answer
    x = 305.87

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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.