Home / 1,685.20-2,325.78-986.60

Finding the Fourth Proportional to 1,685.20, 2,325.78 and 986.60

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Solution

The fourth proportional to 1,685.20, 2,325.78 and 986.60 is: 1,361.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,685.20 : 2,325.78 = 986.60 : x
  2. Step 2: Convert to fraction form
    1,685.20/2,325.78 = 986.60/x
  3. Step 3: Cross multiply
    1,685.20x = 2,325.78 × 986.60
  4. Step 4: Simplify right side
    1,685.20x = 2,294,614.55
  5. Step 5: Solve for x
    x = 2,294,614.55/1,685.20
  6. Step 6: Final answer
    x = 1,361.63

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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.