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Finding the Fourth Proportional to 1,919.70, 2,649.00 and 1,080.21

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Solution

The fourth proportional to 1,919.70, 2,649.00 and 1,080.21 is: 1,490.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,919.70 : 2,649.00 = 1,080.21 : x
  2. Step 2: Convert to fraction form
    1,919.70/2,649.00 = 1,080.21/x
  3. Step 3: Cross multiply
    1,919.70x = 2,649.00 × 1,080.21
  4. Step 4: Simplify right side
    1,919.70x = 2,861,482.82
  5. Step 5: Solve for x
    x = 2,861,482.82/1,919.70
  6. Step 6: Final answer
    x = 1,490.59

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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.