Home / 1,340.20-1,858.99-1,253.80

Finding the Fourth Proportional to 1,340.20, 1,858.99 and 1,253.80

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Solution

The fourth proportional to 1,340.20, 1,858.99 and 1,253.80 is: 1,739.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,340.20 : 1,858.99 = 1,253.80 : x
  2. Step 2: Convert to fraction form
    1,340.20/1,858.99 = 1,253.80/x
  3. Step 3: Cross multiply
    1,340.20x = 1,858.99 × 1,253.80
  4. Step 4: Simplify right side
    1,340.20x = 2,330,801.66
  5. Step 5: Solve for x
    x = 2,330,801.66/1,340.20
  6. Step 6: Final answer
    x = 1,739.14

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.