Home / 2,115.60-2,919.81-1,276.78

Finding the Fourth Proportional to 2,115.60, 2,919.81 and 1,276.78

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Solution

The fourth proportional to 2,115.60, 2,919.81 and 1,276.78 is: 1,762.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,115.60 : 2,919.81 = 1,276.78 : x
  2. Step 2: Convert to fraction form
    2,115.60/2,919.81 = 1,276.78/x
  3. Step 3: Cross multiply
    2,115.60x = 2,919.81 × 1,276.78
  4. Step 4: Simplify right side
    2,115.60x = 3,727,964.91
  5. Step 5: Solve for x
    x = 3,727,964.91/2,115.60
  6. Step 6: Final answer
    x = 1,762.13

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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.