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Finding the Fourth Proportional to 1,313.69, 1,969.20 and 851.76

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Solution

The fourth proportional to 1,313.69, 1,969.20 and 851.76 is: 1,276.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,313.69 : 1,969.20 = 851.76 : x
  2. Step 2: Convert to fraction form
    1,313.69/1,969.20 = 851.76/x
  3. Step 3: Cross multiply
    1,313.69x = 1,969.20 × 851.76
  4. Step 4: Simplify right side
    1,313.69x = 1,677,285.79
  5. Step 5: Solve for x
    x = 1,677,285.79/1,313.69
  6. Step 6: Final answer
    x = 1,276.78

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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.