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Finding the Fourth Proportional to 561.69, 842.72 and 379.77

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Solution

The fourth proportional to 561.69, 842.72 and 379.77 is: 569.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.69 : 842.72 = 379.77 : x
  2. Step 2: Convert to fraction form
    561.69/842.72 = 379.77/x
  3. Step 3: Cross multiply
    561.69x = 842.72 × 379.77
  4. Step 4: Simplify right side
    561.69x = 320,037.88
  5. Step 5: Solve for x
    x = 320,037.88/561.69
  6. Step 6: Final answer
    x = 569.78

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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.