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Finding the Fourth Proportional to 851.10, 1,275.72 and 439.70

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Solution

The fourth proportional to 851.10, 1,275.72 and 439.70 is: 659.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.10 : 1,275.72 = 439.70 : x
  2. Step 2: Convert to fraction form
    851.10/1,275.72 = 439.70/x
  3. Step 3: Cross multiply
    851.10x = 1,275.72 × 439.70
  4. Step 4: Simplify right side
    851.10x = 560,927.71
  5. Step 5: Solve for x
    x = 560,927.71/851.10
  6. Step 6: Final answer
    x = 659.06

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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.