Home / 2,459.20-3,686.40-919.12

Finding the Fourth Proportional to 2,459.20, 3,686.40 and 919.12

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Solution

The fourth proportional to 2,459.20, 3,686.40 and 919.12 is: 1,377.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,459.20 : 3,686.40 = 919.12 : x
  2. Step 2: Convert to fraction form
    2,459.20/3,686.40 = 919.12/x
  3. Step 3: Cross multiply
    2,459.20x = 3,686.40 × 919.12
  4. Step 4: Simplify right side
    2,459.20x = 3,388,243.97
  5. Step 5: Solve for x
    x = 3,388,243.97/2,459.20
  6. Step 6: Final answer
    x = 1,377.78

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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.