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Finding the Fourth Proportional to 1,263.69, 1,891.89 and 851.40

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Solution

The fourth proportional to 1,263.69, 1,891.89 and 851.40 is: 1,274.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,263.69 : 1,891.89 = 851.40 : x
  2. Step 2: Convert to fraction form
    1,263.69/1,891.89 = 851.40/x
  3. Step 3: Cross multiply
    1,263.69x = 1,891.89 × 851.40
  4. Step 4: Simplify right side
    1,263.69x = 1,610,755.15
  5. Step 5: Solve for x
    x = 1,610,755.15/1,263.69
  6. Step 6: Final answer
    x = 1,274.64

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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.