Home / 1,340.20-2,009.70-519.16

Finding the Fourth Proportional to 1,340.20, 2,009.70 and 519.16

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Solution

The fourth proportional to 1,340.20, 2,009.70 and 519.16 is: 778.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,340.20 : 2,009.70 = 519.16 : x
  2. Step 2: Convert to fraction form
    1,340.20/2,009.70 = 519.16/x
  3. Step 3: Cross multiply
    1,340.20x = 2,009.70 × 519.16
  4. Step 4: Simplify right side
    1,340.20x = 1,043,355.85
  5. Step 5: Solve for x
    x = 1,043,355.85/1,340.20
  6. Step 6: Final answer
    x = 778.51

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1.5x scale

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.