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Finding the Fourth Proportional to 369.03, 509.15 and 221.61

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Solution

The fourth proportional to 369.03, 509.15 and 221.61 is: 305.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    369.03 : 509.15 = 221.61 : x
  2. Step 2: Convert to fraction form
    369.03/509.15 = 221.61/x
  3. Step 3: Cross multiply
    369.03x = 509.15 × 221.61
  4. Step 4: Simplify right side
    369.03x = 112,829.08
  5. Step 5: Solve for x
    x = 112,829.08/369.03
  6. Step 6: Final answer
    x = 305.75

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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.