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Finding the Fourth Proportional to 1,685.19, 2,528.46 and 863.76

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Solution

The fourth proportional to 1,685.19, 2,528.46 and 863.76 is: 1,295.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,685.19 : 2,528.46 = 863.76 : x
  2. Step 2: Convert to fraction form
    1,685.19/2,528.46 = 863.76/x
  3. Step 3: Cross multiply
    1,685.19x = 2,528.46 × 863.76
  4. Step 4: Simplify right side
    1,685.19x = 2,183,982.61
  5. Step 5: Solve for x
    x = 2,183,982.61/1,685.19
  6. Step 6: Final answer
    x = 1,295.99

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.