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Finding the Fourth Proportional to 784.48, 1,082.79 and 489.57

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Solution

The fourth proportional to 784.48, 1,082.79 and 489.57 is: 675.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    784.48 : 1,082.79 = 489.57 : x
  2. Step 2: Convert to fraction form
    784.48/1,082.79 = 489.57/x
  3. Step 3: Cross multiply
    784.48x = 1,082.79 × 489.57
  4. Step 4: Simplify right side
    784.48x = 530,101.50
  5. Step 5: Solve for x
    x = 530,101.50/784.48
  6. Step 6: Final answer
    x = 675.74

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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.