Home / 1,422.10-2,131.80-1,276.30

Finding the Fourth Proportional to 1,422.10, 2,131.80 and 1,276.30

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Solution

The fourth proportional to 1,422.10, 2,131.80 and 1,276.30 is: 1,913.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,422.10 : 2,131.80 = 1,276.30 : x
  2. Step 2: Convert to fraction form
    1,422.10/2,131.80 = 1,276.30/x
  3. Step 3: Cross multiply
    1,422.10x = 2,131.80 × 1,276.30
  4. Step 4: Simplify right side
    1,422.10x = 2,720,816.34
  5. Step 5: Solve for x
    x = 2,720,816.34/1,422.10
  6. Step 6: Final answer
    x = 1,913.24

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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.