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Finding the Fourth Proportional to 561.69, 842.18 and 369.09

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Solution

The fourth proportional to 561.69, 842.18 and 369.09 is: 553.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.69 : 842.18 = 369.09 : x
  2. Step 2: Convert to fraction form
    561.69/842.18 = 369.09/x
  3. Step 3: Cross multiply
    561.69x = 842.18 × 369.09
  4. Step 4: Simplify right side
    561.69x = 310,838.37
  5. Step 5: Solve for x
    x = 310,838.37/561.69
  6. Step 6: Final answer
    x = 553.40

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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.