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Finding the Fourth Proportional to 856.13, 1,284.26 and 239.89

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Solution

The fourth proportional to 856.13, 1,284.26 and 239.89 is: 359.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    856.13 : 1,284.26 = 239.89 : x
  2. Step 2: Convert to fraction form
    856.13/1,284.26 = 239.89/x
  3. Step 3: Cross multiply
    856.13x = 1,284.26 × 239.89
  4. Step 4: Simplify right side
    856.13x = 308,077.79
  5. Step 5: Solve for x
    x = 308,077.79/856.13
  6. Step 6: Final answer
    x = 359.85

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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.