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Finding the Fourth Proportional to 1,995.20, 2,989.20 and 1,685.60

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Solution

The fourth proportional to 1,995.20, 2,989.20 and 1,685.60 is: 2,525.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,995.20 : 2,989.20 = 1,685.60 : x
  2. Step 2: Convert to fraction form
    1,995.20/2,989.20 = 1,685.60/x
  3. Step 3: Cross multiply
    1,995.20x = 2,989.20 × 1,685.60
  4. Step 4: Simplify right side
    1,995.20x = 5,038,595.52
  5. Step 5: Solve for x
    x = 5,038,595.52/1,995.20
  6. Step 6: Final answer
    x = 2,525.36

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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.