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Finding the Fourth Proportional to 1,879.64, 2,820.40 and 1,420.22

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Solution

The fourth proportional to 1,879.64, 2,820.40 and 1,420.22 is: 2,131.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,879.64 : 2,820.40 = 1,420.22 : x
  2. Step 2: Convert to fraction form
    1,879.64/2,820.40 = 1,420.22/x
  3. Step 3: Cross multiply
    1,879.64x = 2,820.40 × 1,420.22
  4. Step 4: Simplify right side
    1,879.64x = 4,005,588.49
  5. Step 5: Solve for x
    x = 4,005,588.49/1,879.64
  6. Step 6: Final answer
    x = 2,131.04

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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.