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Finding the Fourth Proportional to 784.22, 1,082.50 and 489.38

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Solution

The fourth proportional to 784.22, 1,082.50 and 489.38 is: 675.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    784.22 : 1,082.50 = 489.38 : x
  2. Step 2: Convert to fraction form
    784.22/1,082.50 = 489.38/x
  3. Step 3: Cross multiply
    784.22x = 1,082.50 × 489.38
  4. Step 4: Simplify right side
    784.22x = 529,753.85
  5. Step 5: Solve for x
    x = 529,753.85/784.22
  6. Step 6: Final answer
    x = 675.52

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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.