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Finding the Fourth Proportional to 784.37, 1,082.54 and 489.73

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Solution

The fourth proportional to 784.37, 1,082.54 and 489.73 is: 675.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    784.37 : 1,082.54 = 489.73 : x
  2. Step 2: Convert to fraction form
    784.37/1,082.54 = 489.73/x
  3. Step 3: Cross multiply
    784.37x = 1,082.54 × 489.73
  4. Step 4: Simplify right side
    784.37x = 530,152.31
  5. Step 5: Solve for x
    x = 530,152.31/784.37
  6. Step 6: Final answer
    x = 675.90

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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.