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Finding the Fourth Proportional to 1,313.28, 1,970.61 and 850.95

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Solution

The fourth proportional to 1,313.28, 1,970.61 and 850.95 is: 1,276.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,313.28 : 1,970.61 = 850.95 : x
  2. Step 2: Convert to fraction form
    1,313.28/1,970.61 = 850.95/x
  3. Step 3: Cross multiply
    1,313.28x = 1,970.61 × 850.95
  4. Step 4: Simplify right side
    1,313.28x = 1,676,890.58
  5. Step 5: Solve for x
    x = 1,676,890.58/1,313.28
  6. Step 6: Final answer
    x = 1,276.87

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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.