Home / 1,919.72-2,649.84-1,422.20

Finding the Fourth Proportional to 1,919.72, 2,649.84 and 1,422.20

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Solution

The fourth proportional to 1,919.72, 2,649.84 and 1,422.20 is: 1,963.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,919.72 : 2,649.84 = 1,422.20 : x
  2. Step 2: Convert to fraction form
    1,919.72/2,649.84 = 1,422.20/x
  3. Step 3: Cross multiply
    1,919.72x = 2,649.84 × 1,422.20
  4. Step 4: Simplify right side
    1,919.72x = 3,768,602.45
  5. Step 5: Solve for x
    x = 3,768,602.45/1,919.72
  6. Step 6: Final answer
    x = 1,963.10

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1.5x scale

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.