Home / 1,921.16-2,650.20-1,291.80

Finding the Fourth Proportional to 1,921.16, 2,650.20 and 1,291.80

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Solution

The fourth proportional to 1,921.16, 2,650.20 and 1,291.80 is: 1,782.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,921.16 : 2,650.20 = 1,291.80 : x
  2. Step 2: Convert to fraction form
    1,921.16/2,650.20 = 1,291.80/x
  3. Step 3: Cross multiply
    1,921.16x = 2,650.20 × 1,291.80
  4. Step 4: Simplify right side
    1,921.16x = 3,423,528.36
  5. Step 5: Solve for x
    x = 3,423,528.36/1,921.16
  6. Step 6: Final answer
    x = 1,782.01

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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.