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Finding the Fourth Proportional to 851.14, 1,275.81 and 439.84

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Solution

The fourth proportional to 851.14, 1,275.81 and 439.84 is: 659.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.14 : 1,275.81 = 439.84 : x
  2. Step 2: Convert to fraction form
    851.14/1,275.81 = 439.84/x
  3. Step 3: Cross multiply
    851.14x = 1,275.81 × 439.84
  4. Step 4: Simplify right side
    851.14x = 561,152.27
  5. Step 5: Solve for x
    x = 561,152.27/851.14
  6. Step 6: Final answer
    x = 659.29

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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.