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Finding the Fourth Proportional to 369.89, 554.19 and 215.42

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Solution

The fourth proportional to 369.89, 554.19 and 215.42 is: 322.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    369.89 : 554.19 = 215.42 : x
  2. Step 2: Convert to fraction form
    369.89/554.19 = 215.42/x
  3. Step 3: Cross multiply
    369.89x = 554.19 × 215.42
  4. Step 4: Simplify right side
    369.89x = 119,383.61
  5. Step 5: Solve for x
    x = 119,383.61/369.89
  6. Step 6: Final answer
    x = 322.75

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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.