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Finding the Fourth Proportional to 867.96, 1,301.62 and 319.99

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Solution

The fourth proportional to 867.96, 1,301.62 and 319.99 is: 479.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    867.96 : 1,301.62 = 319.99 : x
  2. Step 2: Convert to fraction form
    867.96/1,301.62 = 319.99/x
  3. Step 3: Cross multiply
    867.96x = 1,301.62 × 319.99
  4. Step 4: Simplify right side
    867.96x = 416,505.38
  5. Step 5: Solve for x
    x = 416,505.38/867.96
  6. Step 6: Final answer
    x = 479.87

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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.