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Finding the Fourth Proportional to 784.44, 1,082.22 and 489.18

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Solution

The fourth proportional to 784.44, 1,082.22 and 489.18 is: 674.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    784.44 : 1,082.22 = 489.18 : x
  2. Step 2: Convert to fraction form
    784.44/1,082.22 = 489.18/x
  3. Step 3: Cross multiply
    784.44x = 1,082.22 × 489.18
  4. Step 4: Simplify right side
    784.44x = 529,400.38
  5. Step 5: Solve for x
    x = 529,400.38/784.44
  6. Step 6: Final answer
    x = 674.88

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1.5x scale

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.