Home / 1,782.09-2,460.65-1,390.05

Finding the Fourth Proportional to 1,782.09, 2,460.65 and 1,390.05

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Solution

The fourth proportional to 1,782.09, 2,460.65 and 1,390.05 is: 1,919.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,782.09 : 2,460.65 = 1,390.05 : x
  2. Step 2: Convert to fraction form
    1,782.09/2,460.65 = 1,390.05/x
  3. Step 3: Cross multiply
    1,782.09x = 2,460.65 × 1,390.05
  4. Step 4: Simplify right side
    1,782.09x = 3,420,419.58
  5. Step 5: Solve for x
    x = 3,420,419.58/1,782.09
  6. Step 6: Final answer
    x = 1,919.33

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1.5x scale

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.