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Finding the Fourth Proportional to 851.39, 1,276.70 and 389.06

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Solution

The fourth proportional to 851.39, 1,276.70 and 389.06 is: 583.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.39 : 1,276.70 = 389.06 : x
  2. Step 2: Convert to fraction form
    851.39/1,276.70 = 389.06/x
  3. Step 3: Cross multiply
    851.39x = 1,276.70 × 389.06
  4. Step 4: Simplify right side
    851.39x = 496,704.57
  5. Step 5: Solve for x
    x = 496,704.57/851.39
  6. Step 6: Final answer
    x = 583.41

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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.