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Finding the Fourth Proportional to 856.65, 1,284.38 and 439.16

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Solution

The fourth proportional to 856.65, 1,284.38 and 439.16 is: 658.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    856.65 : 1,284.38 = 439.16 : x
  2. Step 2: Convert to fraction form
    856.65/1,284.38 = 439.16/x
  3. Step 3: Cross multiply
    856.65x = 1,284.38 × 439.16
  4. Step 4: Simplify right side
    856.65x = 564,040.80
  5. Step 5: Solve for x
    x = 564,040.80/856.65
  6. Step 6: Final answer
    x = 658.43

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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.