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Finding the Fourth Proportional to 867.21, 1,299.75 and 379.69

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Solution

The fourth proportional to 867.21, 1,299.75 and 379.69 is: 569.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    867.21 : 1,299.75 = 379.69 : x
  2. Step 2: Convert to fraction form
    867.21/1,299.75 = 379.69/x
  3. Step 3: Cross multiply
    867.21x = 1,299.75 × 379.69
  4. Step 4: Simplify right side
    867.21x = 493,497.40
  5. Step 5: Solve for x
    x = 493,497.40/867.21
  6. Step 6: Final answer
    x = 569.07

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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.