Home / 1,405.90-2,104.80-1,325.80

Finding the Fourth Proportional to 1,405.90, 2,104.80 and 1,325.80

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Solution

The fourth proportional to 1,405.90, 2,104.80 and 1,325.80 is: 1,984.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,405.90 : 2,104.80 = 1,325.80 : x
  2. Step 2: Convert to fraction form
    1,405.90/2,104.80 = 1,325.80/x
  3. Step 3: Cross multiply
    1,405.90x = 2,104.80 × 1,325.80
  4. Step 4: Simplify right side
    1,405.90x = 2,790,543.84
  5. Step 5: Solve for x
    x = 2,790,543.84/1,405.90
  6. Step 6: Final answer
    x = 1,984.88

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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.