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Finding the Fourth Proportional to 784.36, 1,082.79 and 490.06

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Solution

The fourth proportional to 784.36, 1,082.79 and 490.06 is: 676.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    784.36 : 1,082.79 = 490.06 : x
  2. Step 2: Convert to fraction form
    784.36/1,082.79 = 490.06/x
  3. Step 3: Cross multiply
    784.36x = 1,082.79 × 490.06
  4. Step 4: Simplify right side
    784.36x = 530,624.20
  5. Step 5: Solve for x
    x = 530,624.20/784.36
  6. Step 6: Final answer
    x = 676.51

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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.