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Finding the Fourth Proportional to 369.18, 509.47 and 221.83

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Solution

The fourth proportional to 369.18, 509.47 and 221.83 is: 306.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    369.18 : 509.47 = 221.83 : x
  2. Step 2: Convert to fraction form
    369.18/509.47 = 221.83/x
  3. Step 3: Cross multiply
    369.18x = 509.47 × 221.83
  4. Step 4: Simplify right side
    369.18x = 113,013.90
  5. Step 5: Solve for x
    x = 113,013.90/369.18
  6. Step 6: Final answer
    x = 306.12

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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.