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Finding the Fourth Proportional to 859.38, 1,288.86 and 282.12

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Solution

The fourth proportional to 859.38, 1,288.86 and 282.12 is: 423.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.38 : 1,288.86 = 282.12 : x
  2. Step 2: Convert to fraction form
    859.38/1,288.86 = 282.12/x
  3. Step 3: Cross multiply
    859.38x = 1,288.86 × 282.12
  4. Step 4: Simplify right side
    859.38x = 363,613.18
  5. Step 5: Solve for x
    x = 363,613.18/859.38
  6. Step 6: Final answer
    x = 423.11

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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.