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Finding the Fourth Proportional to 784.53, 1,081.85 and 674.37

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Solution

The fourth proportional to 784.53, 1,081.85 and 674.37 is: 929.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    784.53 : 1,081.85 = 674.37 : x
  2. Step 2: Convert to fraction form
    784.53/1,081.85 = 674.37/x
  3. Step 3: Cross multiply
    784.53x = 1,081.85 × 674.37
  4. Step 4: Simplify right side
    784.53x = 729,563.81
  5. Step 5: Solve for x
    x = 729,563.81/784.53
  6. Step 6: Final answer
    x = 929.94

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.