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Finding the Fourth Proportional to 867.25, 1,301.42 and 319.69

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Solution

The fourth proportional to 867.25, 1,301.42 and 319.69 is: 479.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    867.25 : 1,301.42 = 319.69 : x
  2. Step 2: Convert to fraction form
    867.25/1,301.42 = 319.69/x
  3. Step 3: Cross multiply
    867.25x = 1,301.42 × 319.69
  4. Step 4: Simplify right side
    867.25x = 416,050.96
  5. Step 5: Solve for x
    x = 416,050.96/867.25
  6. Step 6: Final answer
    x = 479.74

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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.