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Finding the Fourth Proportional to 369.65, 554.29 and 215.61

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Solution

The fourth proportional to 369.65, 554.29 and 215.61 is: 323.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    369.65 : 554.29 = 215.61 : x
  2. Step 2: Convert to fraction form
    369.65/554.29 = 215.61/x
  3. Step 3: Cross multiply
    369.65x = 554.29 × 215.61
  4. Step 4: Simplify right side
    369.65x = 119,511.85
  5. Step 5: Solve for x
    x = 119,511.85/369.65
  6. Step 6: Final answer
    x = 323.31

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.