Home / 1,731.60-2,390.40-1,378.80

Finding the Fourth Proportional to 1,731.60, 2,390.40 and 1,378.80

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Solution

The fourth proportional to 1,731.60, 2,390.40 and 1,378.80 is: 1,903.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,731.60 : 2,390.40 = 1,378.80 : x
  2. Step 2: Convert to fraction form
    1,731.60/2,390.40 = 1,378.80/x
  3. Step 3: Cross multiply
    1,731.60x = 2,390.40 × 1,378.80
  4. Step 4: Simplify right side
    1,731.60x = 3,295,883.52
  5. Step 5: Solve for x
    x = 3,295,883.52/1,731.60
  6. Step 6: Final answer
    x = 1,903.37

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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.